I was asked to put together this high-level and traditional software
life cycle information as a favor for a friend of a friend, so I
thought I might as well share it with everybody.
The General Model
Software life cycle models describe phases of the software cycle and
the order in which those phases are executed. There are tons of
models, and many companies adopt their own, but all have very similar
patterns. The general, basic model is shown below:
Each phase produces deliverables required by the next phase in the
life cycle. Requirements are translated into design. Code
is produced during implementation that is driven by the design.
Testing verifies the deliverable of the implementation phase against
requirements.
Requirements
Business requirements are gathered in this phase. This phase
is the main focus of the project managers and stake holders.
Meetings with managers, stake holders and users are held in order to
determine the requirements. Who is going to use the system?
How will they use the system? What data should be input into the
system? What data should be output by the system? These are
general questions that get answered during a requirements gathering
phase. This produces a nice big list of functionality that the
system should provide, which describes functions the system should
perform, business logic that processes data, what data is stored and
used by the system, and how the user interface should work. The
overall result is the system as a whole and how it performs, not how it
is actually going to do it.
Design
The software system design is produced from the results of the
requirements phase. Architects have the ball in their court
during this phase and this is the phase in which their focus
lies. This is where the details on how the system will work is
produced. Architecture, including hardware and software,
communication, software design (UML is produced here) are all part of
the deliverables of a design phase.
Implementation
Code is produced from the deliverables of the design phase during
implementation, and this is the longest phase of the software
development life cycle. For a developer, this is the main focus
of the life cycle because this is where the code is produced.
Implementation my overlap with both the design and testing
phases. Many tools exists (CASE tools) to actually automate the
production of code using information gathered and produced during the
design phase.
Testing
During testing, the implementation is tested against the
requirements to make sure that the product is actually solving the
needs addressed and gathered during the requirements phase. Unit
tests and system/acceptance tests are done during this phase.
Unit tests act on a specific component of the system, while system
tests act on the system as a whole.
So in a nutshell, that is a very basic overview of the general
software development life cycle model. Now lets delve into some
of the traditional and widely used variations.
Waterfall Model
This is the most common and classic of life cycle models, also
referred to as a linear-sequential life cycle model. It is very
simple to understand and use. In a waterfall model, each phase
must be completed in its entirety before the next phase can
begin. At the end of each phase, a review takes place to
determine if the project is on the right path and whether or not to
continue or discard the project. Unlike what I mentioned in the
general model, phases do not overlap in a waterfall model.
Advantages
- Simple and easy to use.
- Easy to manage due to the rigidity of the model – each phase has specific deliverables and a review process.
- Phases are processed and completed one at a time.
- Works well for smaller projects where requirements are very well understood.
Disadvantages
- Adjusting scope during the life cycle can kill a project
- No working software is produced until late during the life cycle.
- High amounts of risk and uncertainty.
- Poor model for complex and object-oriented projects.
- Poor model for long and ongoing projects.
- Poor model where requirements are at a moderate to high risk of changing.
V-Shaped Model
Just like the waterfall model, the V-Shaped life cycle is a
sequential path of execution of processes. Each phase must be
completed before the next phase begins. Testing is emphasized in
this model more so than the waterfall model though. The testing
procedures are developed early in the life cycle before any coding is
done, during each of the phases preceding implementation.
Requirements begin the life cycle model just like the waterfall
model. Before development is started, a system test plan is
created. The test plan focuses on meeting the functionality
specified in the requirements gathering.
The high-level design phase focuses on system architecture and
design. An integration test plan is created in this phase as well
in order to test the pieces of the software systems ability to work
together.
The low-level design phase is where the actual software components
are designed, and unit tests are created in this phase as well.
The implementation phase is, again, where all coding takes
place. Once coding is complete, the path of execution continues
up the right side of the V where the test plans developed earlier are
now put to use.
Advantages
- Simple and easy to use.
- Each phase has specific deliverables.
- Higher chance of success over the waterfall model due to the development of test plans early on during the life cycle.
- Works well for small projects where requirements are easily understood.
Disadvantages
- Very rigid, like the waterfall model.
- Little flexibility and adjusting scope is difficult and expensive.
- Software is developed during the implementation phase, so no early prototypes of the software are produced.
- Model doesn’t provide a clear path for problems found during testing phases.
Incremental Model
The incremental model is an intuitive approach to the waterfall
model. Multiple development cycles take place here, making the
life cycle a “multi-waterfall” cycle. Cycles are divided up into
smaller, more easily managed iterations. Each iteration passes
through the requirements, design, implementation and testing phases.
A working version of software is produced during the first
iteration, so you have working software early on during the software
life cycle. Subsequent iterations build on the initial software
produced during the first iteration.
Advantages
- Generates working software quickly and early during the software life cycle.
- More flexible – less costly to change scope and requirements.
- Easier to test and debug during a smaller iteration.
- Easier to manage risk because risky pieces are identified and handled during its iteration.
- Each iteration is an easily managed milestone.
Disadvantages
- Each phase of an iteration is rigid and do not overlap each other.
- Problems may arise pertaining to system architecture because not
all requirements are gathered up front for the entire software life
cycle.
Spiral Model
The spiral model is similar to the incremental model, with more
emphases placed on risk analysis. The spiral model has four
phases: Planning, Risk Analysis, Engineering and Evaluation. A
software project repeatedly passes through these phases in iterations
(called Spirals in this model). The baseline spiral, starting in
the planning phase, requirements are gathered and risk is
assessed. Each subsequent spirals builds on the baseline spiral.
Requirements are gathered during the planning phase. In the
risk analysis phase, a process is undertaken to identify risk and
alternate solutions. A prototype is produced at the end of the
risk analysis phase.
Software is produced in the engineering phase, along with testing at
the end of the phase. The evaluation phase allows the customer to
evaluate the output of the project to date before the project continues
to the next spiral.
In the spiral model, the angular component represents progress, and the radius of the spiral represents cost.
Advantages
- High amount of risk analysis
- Good for large and mission-critical projects.
- Software is produced early in the software life cycle.
Disadvantages
- Can be a costly model to use.
- Risk analysis requires highly specific expertise.
- Project’s success is highly dependent on the risk analysis phase.
- Doesn’t work well for smaller projects.
And that’s it. If you have any input, especially your views on
advantages and disadvantages of any particular model, feel free to
leave them in the comments and I can add them to my copy.
this is tuttii!!!
this is tuttii!!!
Thanks.. very useful article.
Hi,
SDLC Models given here are easy to Understand and very good for Beginners like me.
Thank you.
Nanda Kumar.
Much helping and quick learning material …. Good Job Man…
eeg
can u give explanation for the other models as well as i have heard abt iteraton,protype and classical models
this article is superb and easy to understand
I would like to ask “isnt maintenance part of Software development life cycle ? and if it is , then isnt it the longest phase of software development life cycle ?”
Thanks for the information shared here. that was an interesting and informative. I had a good experience by participating in the Cloud Computing and SOA Conference in 2009 which is most influential Business Technology Conference covering latest innovations and trends of Cloud Computing, SOA and its technologies. I learnt lot of new technologies in Cloud Computing. And I am planning to attend 2010 edition as well. I found the information about the conference from http://www.btsummit.com
Very good article about SDLC,n its a very good site
thank you post such an interesting life cycle model ,,,,
I want to know about the Prototyping life cycle,
can you throw some light on that,,,,,,,
thanks
thanks,for a good explanation in an easy and understandable form.
it’s really very good material.
The new free wiki based open-source technology systems and software development life cycle over at http://OpenSDLC.org is worth checking out and even better still it’s creative commons so it’s free to copy, paste, edit and use …or for just under a hundred bucks you can get all the original files and tweak them to suit your needs.
Good overview. Appreciate it!!
This information is extremely great but can anyone tell me which companies use each of these models
Hi,
i really understand the SDLC…….., thank you sir.
Hi,
i really understand the SDLC…….., thank you sir.
The above models are very clear and understndable..
where is the prototype model???
i want it in detail…
Great article very interesting indeed!
Thank you for sharing good information.
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This article was great. Great help For my campus interview.
CAN SOMEONE PLEASE GIVE ME A CASE STUDY FOR A V-SHAPE MODEL AND A AN INCREMENTAL MODEL PLEASE. THANK YOU…I’LL BE CHECKING EVERY COUPLE OF HOURS FOR A REPLY….
CAN SOMEONE PLEASE GIVE ME A CASE STUDY FOR A V-SHAPE MODEL AND A AN INCREMENTAL MODEL PLEASE. THANK YOU…I’LL BE CHECKING EVERY COUPLE OF HOURS FOR A REPLY….
quite informative……..
Thanks, this is brilliant! What about rapid prototyping or rapid application methodology?
I’ve been trying to determine a distinction between the iterative and incremental model and I can’t figure it out… I’ve read various information and the two terms are often used interchangably. The reason that I am asking is that early in the comments thread Jeremy stated “XP is iterative *and* incremental (like RUP and essentially all modern processes).”. What exactly is “iterative *and* incremental” as opposed to just iterative or incremental?
Sir, I want details about Prototype model & WIN-WIN spiral model
hello , this is really good document.
i have some questions regarding asp.net project, which life cycle u prefer for it
it’s really verry good material.it is exact,simple and short.
nice content.Thanks
hai.this article gives a clear view and exact definition,I would like to thank you,
wow…really good job…..keep up the same work
i just wonna ask u a qu ?
may i know the books u refere? any particular Authora??
plz? & thk u
keka
I have been asked to introduce a suitable lifecycle for a payroll system. From what I have read, the spiral lifecycle seems most suitable.
Would you agree or am I wrong in my decision?
Cheers
This is very informative but do u have anything on the object reuse model and the formal transformation model?
Thanks you so much!!
I needed quick references for my oral examination!!
It’s really helpful…..
adasdadasd
hai
This article made me sh!t my pants!
thank you so much!
ps: my pants are squidgy now
reading this article was so exhilerating that i quite literally shit my pants,
thanks a bunch
Betty Swollocks
anywhere i cud find info on the fountain model?
i have 1 nut n caused it by playing golf wiv my daddy
Bubble!
Hey Ray,
This article helped me a lot in my s/w engg assignment.. Thanks for posting this information.
Cheers.
I liked the article, its is explained in very easy way. Very useful information for SDLC. Now i am exploring UML and SDLC.
Nice simple description. A couple of comments and a suggestion.
Most real processes tend to be a mixture of SDLMs. The real trick is to pick a lifecycle very early in the project and stick with it. Each has its uses (with the possible exception of the waterfall).
The article could benefit from a ‘type of project to apply it to …’, i.e. V model – high assurance safety/security critical, incremental – database or MIS development
NICE
Among all those confusing huge chunks of sentences written about Life cycle models, this is simple, crisp and but still effective…
Would be helpful if more could be added related to agile, RAD, JAD, RUP, etc.,
i fancy u pooja
Thanks a lot this has helped so much with my university assignment so gratefull thank you
Disadvantage of Developing Programs with No SDLC Mode
Lack of proper documentation is one of the reasons why a program with no SDLC model is undesirable. There’s no problem in the implementation of software but with no SDLC, there are no documentations to support the development of the program. Programmers could create their own documentation, but this is only for the program and nothing else. The philosophy, studies on why it should work; development and troubleshooting are parts of proper documentation which is outlined in SDLC. A program that has no SDLC cannot be duplicated if there’s a documentation that identifies the answer.
Another disadvantage of developers who don’t follow SDLC is the inability to handle programs with complex needs. In house developers may be able to force themselves to create programs but the larger picture is missed. In a business world, developers have to work with business managers and there are certain needs that should be properly outlined.
Disadvantage of Programs/Websites with SDLC Model
Thinking about the disadvantages of a SDLC model is like looking for a needle in the haystack. But the closest disadvantage anyone could think of SDLC is the difference between what is written in paper and what is actually implemented. There are things that are happening in the actual work that the paper doesn’t see. This gives a good impression for the clients especially for 3rd party developers but when the software is actually launched it’s on a very bad situation. The actual situation of software development could be covered by fancy paperwork of SDLC.
Another disadvantage of a program or software that follows the SDLC program is it encourages stiff implementation instead of pushing for creativity in different software. Although there are SDLC models where programmers could apply their creative juices, it’s always in the realm of what is needed instead of freely implementing what the developers think of necessary in the present environment. There are so many things that could be done by developers if there are no boundaries or limitations in what should be developed.
You make my job easy. you simplified the models in SDLC. This is good for assignment purpose. Thanks Raymond
Your article was simple to understand and very useful for my assignment work.It helped me in studies too.thank you raymond.
LUV YOU NEH!
plz suggest which model should be used for warehouse management system
Hi
thanx you your data help me a lot in my studies & in project .
HI
thank you for sharing all information it is greatly appriciated.
Hi nice and informative article regarding spiral model, may i know about water fall model and iterative waterfall model?
can u pls talk about the dependability measurement attributes
thanks for the information provided… it was useful for my assignment work.. it would be fine if you could include RAD model also
very simple to understand and also gives a lot of information
Thanx 4 the material.
Thanx 4 the material.
Yur sites th BOMB son
big up yer lyf cycl
BRAP
your article contain valuable information…….
is there any relational between each model ?
hi,
thank you for this great information it will be a great help for my final year project.
Thanks, i appreciate for your dedication on this chapter of software development more especially your brevity is awesome. I had like to ask for an additional tutorials about Component Based software development & reusable software development models.
Thanks
Your article is too simple to understand and very useful for my assignment work.It helped me in my studies. but apart from data your link have more comments. thank you.
Raymond.
Thank u loads for this.. was very helpful for one of my projects…
Shukriya….tussi wadda changa kaam kitta hai…….
sahi hai bhai hindi me bole to dhanyawaad……..,,,,shukriya,,,,,,so allah haafis,,shabbakher,,,,gudbye
say me about object oriented model
i want to know about object oriented model
HI,
This is very nice and informative.
Thank you
hello,
thank you for all information but what about the evolutionary model?
Hi
Your article was simple to understand and very useful for my assignment work.It helped me in studies too.thank you raymond.
hi this article is very useful
Hey its really useful for me.. But the content is not enough.. Nice article…
very useful diagrams. thnx all
Nice post
Please see this link and post your valuable comments
http://infosysblogs.com/oracle/2008/12/need_for_expansion_of_product.html#more
Nice post
Please see this link and post your valuable comments
http://infosysblogs.com/oracle/2008/12/need_for_expansion_of_product.html#more
This is a good article to understand as a newbie. This is really helpful to understand the basic concept about SDLC.
Thanks a lot…
Bajrang
Ray!
It is really a helpful artical, and helped me a lot in my study through SDLC. The language is clear and easy to understand.
Thank you so much.
Hey Ray!! I liked how this is explained in a clear cut way ..I liked the points way of advantages and disadvantages.I learnt a lot through this paper.I liked how it is presented..
This is too good and easy to understand.this really helps me.
Thanks
Fantastic!1!!111!!!1!1!!
this is good dude
thanks for this info!!!!
Thanks for your efforts. Good article and to the point.
Good one ya!
hey… this was exactly what freshers like me look for… thanks for making it this simple to understand…. btw.. can u explain RAD model n inform bout what is 4th generation model???
YA IT GOOD ONE SIMPLY THE BEST
Wow! The comments and feedback are becoming longer than the article!
I have been seeing more hybrid models for software development, but I am curious as to whether there is an SDLC approach that attempts to take a taxonomy of all software dev processes and create an approach to SDLC that is custom tailored as appropriate to the project.
This would be an alternate to the current trend-take a model and adapt it to the project’s needs in a haphazard manner.
There are several good taxonomies available, but there are also certain areas that I have been unable to find taxonomy. For example: requirements representations. Has anyone seen a comprehensive taxonomy of requirements representations? The IEEE definition includes the form of representation as a part of the definition of a requirement. But can’t a requirement definition be created independently of the form of representation?
Thanks,
Andy-U of MN CSci student
This is too good and easy to understand.this really helps me.
Thanks
well thnx man
its satisfaction
It is very simple n informative too..
thank u
A good article.Was quit helpfull to understand the SDLC in short.
i am very very thankful to you for this topic.Before this
my mind was full of confusions about this topic.
Again very thankful to you
name:tariq
state:kashmir
hi
how can i get full detail of the topic of system life cycle.
can any one give me information on our to get it.
thanks.
please there are more software development models that are not here some of which are build and fixed model, implementation model etc.
it helps me to understand basics of SDLC….
this site is good and very helpful for us.
god bless!!!
i think s/w eng is so vast & nobody is expert.
Great info, have been trying to get a good basic understanding for a long time. Thanks
hye i think this is the most good explanation i read. keep it up raymond lewallen.
but i want to ask is there any explanation about system development life cycle (SDLC) which is each phases are overlap between other phases.
..malaysians..
it is very good article.
Thanking you. it is very helpful for us. But some more models are expect from you like proto typeing, RAD model.
Really its must need for beginners in SDLC……
Thanks. you didnt mention code and fix model
Thanks U gave what we need and we expect more from u.
Thanks for sharing your knowledge and skills, this documentation is very much usefull for me.
Nice artical and its simple, short and having useful information.
Thanks
E.Ragoubady
thanks a lot for providing such a precise information about the software development life cycle…it has really made my work easier. i am easily able to understand this important portion of software engineering very well through the information you have provided.
Hi………those para r very helpful to understand SDLC
, So like thanks to body, who uploded those mattes
This site is useful for the software builders.
Really Informative…
Thanks..
this is fabulous!
but very boring to read!
this should be short & sweet!
Hey Raymond u’v been a great help ur article helped me a lot.Bi ups to you.Thank you.
thanks a lot for this, will u post some other models
regards
sathish
it very useful for me
good artical on sdlc modell
its veryuseful for us…
i have to verify this url only… abt s.w testing
thanks
Hi All,
Really very informative and interesting topics…
Regards,
Syed
Hi All,
The above S/W development models are really very informative..
Regards,
SyedOmer
Really a good one with minimal lanuage helping a begineer to understand terms and their scopes.
Excellent article.Helped alot for improving my knowledge.
Excellent article.Helped alot for improving my knowledge.
Excellent articale.Helped alot for improving my knowledge.
Is software project planning important?Where does planning lies in the SDLC? What is the importance of rsik analysis? If project fails then is it totally depend upon development Model or others factors can be blamable?
hi thanks its vry useful to me … i wanna check wit u some thing .. hey can i use spiral model for the big cash flow management software ….if u noe plz reply to nishanthan1989@yahoo.com..
if u can plz help me …
hi….
this article is really good.PLZ MAKE SUCH TYPE OF ARTICLES MORE……….. THANX A LOT
its very good for the novice learners who could understand as fast as they can.this is one of the best material
thanks. nice article
This is a good article. Eventhough, we are talking about new models like XP, SCRUM, RUP, at the end is it not a typical waterfall model executed for the small scope considered in that iteration?
Can you throw some light on the criteria of using different models/methodologies in software development and think of comparing on some parameters . Like when we can use WF, when we can use XP and when we can use SCRUM or RUP or DSDM or RAD or Iterative etc.,,
in V -MODEL diagram
u are not specified the UAT TESTING nad not concen code it good article except V MODEL
KS THANGAVEL
velus.ks@gmail.com
in articles
in V MODEL not specified UAT testing and coding
consider it
KS THANGAVEL
velus.ks@gmail.com
Its very nice and much helpful.
Thanks a lot
Good article on SDLC in a simple language, it is more informative and easy to understand the different models. Thanks.
what is FISH MODEL?
thank u. really helpfull article for my assignment
Please elaborate the models. explainging in detail will mahe it clear to understand it well.
Any ways thanks for the article. I can’t say it is a good one but can be helpful to beginners.
very helpful, our text book only provides one example. I appreciate these thourough examples without them I;ll still be clueless as to how to do my homework.
Awesome stuff. Priceless. I’m an MBA for more than 2 years now, I never understood the differences better before. It cleared all my small but important doubts. Thank you for posting them.
Really superb article ….ever I have seen.
It’s helpful for all
Really superb article ….ever I have seen.
It’s helpful for all
I’m doing an assignment and i dont know if prototyping is a model or if spiral model and RAD are examples of prototyping
yarrr
hi,
IN the release , please mention about evolutionary , RAD models also ……..
Thanks
rashmi.
hi,
The content is really good , well my question according to u , what is requirement
i. condition.
ii. standard
iii.process.
iv.none
plz answer the question ………..
very good informatinon on s/w dev models
Thank you Raymon,
This is good article with simple words, which is simple to understand
Appreciatively, this write up has really helped me in my final year project tks a lot
HI
Thanks this is great article
this is like a gift for beginners, thanks …..
That is very interesting information. I have worked several years in the automotive industry, in engine management system where the V-cycle is widely used.
I have now changed industry and struggle with the implementation of an ERP system. More specifically, we struggle with all the modules communicating with the ERP system, such as generation of sales report.
Anyone has an idea of what cycle works best for that type of application?
Thanks
Lol
Nice explanation…. Very easy to understand… Really good job
HI!
Thanks Its Realy Good & Understandable.Its Limited But Very Clear & Understandable.
I Like The Digramaticaly Work.
its gud n well organized article ;Thanx 4 such a nice effort
thanks for your information
Hey i have made a chat sercer using C#.Net bt now at the time of documentation i dont know which ASLC model i should choose???
Nice Work Yeh
The best breakdown of SDLC models, I have ever come across, I’m saving this.
good. but not sufficient
The explanation is quite well.It would be helpfull for beginners if some more models like evolutionary prototype,throwaway prototype,iterative enhancement models are involved and there is need of a more in depth exaplanation of the topic.
you are handled the diff models
how to develop the new models?
if you are focus in requirement to sys.testing is this enough
ur answer is yes- ok
if no means which area want to cover
pls reply in my id.
please i need information on sdlc, mostly the advantages and disadvantages,methodology
It was quite good the imformation. However I think you could have gone more in depth about the pros and cons and given examples i.e why is is poor for “Poor model for complex and object-oriented projects.”? Also maybe a introduction to RAD would have been good. However a good document
Jo
Thank yiu for your information . They are fantastic!!
hi
it’s very good as a start. thanks for your info.
Note-> Agile method come under which modle: Iterative or Incremental modle.
i have some doubt.
Hi, this is vishala what are the models u given are perfect but i want on Agile model and which situation we can go for this type of model
if u provide the answer it will be a great favour for me.
thank you.
How about a little Rational Unified Process for software development??
Thanku so much..It’s very useful 4 me…
Very Good Info for starter. thanks for your Information.
I think its a wonderful post. Only one thing i would like to comment on Spiral Model. Its disadvantages could also include that: Since changes can occur after every customer review, too many changes can affect the quality.
Please guide me if i am wrong.
Good and a usefull article.
Hi Mr. Raymond Lewallen
Im kartheek.. im working as QA engineer India.
Actually i want some information about newly introduced SDLC model… Think its name is Gen3
If you know about that… Im expecting some valueble information from you.
That’s very good look. Testers and coders see more clearly where they should be standing, and when they should implement their jobs. I can find myself where I am in those cycle. Gratefully!
I WANT TO KNOW THE APPROPRIATE SDLC MODEL BEST SUITED FOR DEVELOPING A SOLUTION TO A HEALTHCARE SYSTEMS AND WHY?. INTERESTING SITE FOR INFORMATION.
That’s a good list to compare and choose development models to meet specific requirements….thanks
can u tell me the evolutionary model and reuse based development and formal model and their advantage and disadvantage??
thank u so much .this is a very useful article for me
Can you please explain about Agile process? Thanx raj
thanks for help
i make a homework for my university and i can find advantages and disandantages adout life cycle;Can you help me.
Its really helping artical
How come you don’t have any information on the Evolutionary Prototype Life Cycle Model? I would really appreciate if you would add this to your page.
Thank U for giving such useful information, this is covering almost of information that is required
thank you for a simplified version of the SDLC models, all this goes in my task assignment
)
finally, i can actually understand this, thanks for putting it up, its really helped me with my IT assianment.
this page really acts as a systematic guide for the software development
can u plz discuss prototyping model in d same manner…
this a very nice article that helps the students to understand the concept very well also it acts as a guide for the one who are designing the software fror the first time.
I am really impressed with this article!!!
Great post.. Helped me a lot
some of this information is also from
http://www.softdevteam.com/V-shaped-lifecycle.asp
did you write this yourself? honestly?
Very good work
This document is informative. You explained alot in few words. Thanx
Really fentastic…..searching in various sites but couldnt able to get proper info….
really good material and really it was short and detail…
Good job Keep it up….
awaiting some more from you….
Really it is a cool and informative.
Thanks for sharing it.
what about evolutionary development? fountain approach, formal transformation, re-use oriented approach etc. Would like to know about those ones as well. Please provide me with a link if u know of any
its a nice job very easy to understand boss
very valuable
its nice that every body liked it. really its to the point and at the same time it would be better if u provide a link to other page to detailed descriptions. and u can include other software models also like Extreme Programming and Concurent engineering.
any way thanks
pls give me the precise information abt v-v model with diagram
Wow! So many replies and ticking…
Guess its because Google has listed your link in first page! Well, I liked the V-Shaped LifeCycle Model representation. It explains the crux and is easy to understand. With all respect, good work.
Excellent, Thanks for giving such a simple article
Thnx a lot, it is really useful..
Keep up the good work….
but u didn’t mention refinement of v model.pls provide that info………………………..
thank “U” Mama
i wish you all happy long life and prosperity
i am trying to Keeping touch wIth u
Excellent
its very useful post….thanks a lot.
hi,
Raymond
i wish you all happy long life and prosperity
Raymond
i wish you all happy long life and prosperity
ei.thanks for this site but cani request for the informatrion about system development life cycle its history,importance, advantages and disadvantages>>pls\
Thak U very much sir for your kind coopereation by making this valuable notes on SDLC models to be viewed on WWW globally. This really made me to understand different models easily.
Best regards
Hari Prashad Pant
Jitendra, what are you not convinced of, and what do you think I was trying to convince you of believing? I was not aware this article was attempting to convince anybody of anything. It is an information article, not a marketing avenue.
dear sir,
have read about your article,
but i am not totally convinced,
these days formal methods are increasing exponentially.on the other hand software industries are using mixture of life cylce models……… like the win-win spiral model and the formal methods..
so what is the best practice to be followed…
also tell this in regards of the sowtware size…small..medium.large
and if possible mail me at
jitencool@gmail.com
THANKZ THAT REALLY HELP ME,I STRUGGLING WITH C.
This is really nice.My project manager really appreciates it.
COULD SOMEBODY PLS EXAPLAIN THE DIFFERNCE BETWEEN AGILE AND OTHER MODELS
WHAT ABOUT AGILE MODEL. CAN SOMEBODY EXPLAIN ABOUT DIFFERNCE BETWEEN AGILE AND OTHER MODELS ,PLS.
This is simply superb, ideal way of explaining SDLC and anyone can understand
Very Informative but I would like to know about a few more other models. Models like, Evolutionary Development, Formal Transformaton and Reuse- Oriented System.
Thanks a lot for your information here.
It really helps with me.
Really, thanks again!
Best regards,
thanks for sharing this information..
it was very helpful to me and simple and made all my points clear regarding the models thankq very much
Good explanation and comparision on SDLC Models, I think most of the companies/products use a combination of models, like Incremental and Iteration / water fall to get the best.
it is easy to understand for each model advantages and disadvantages also given
This is very nice and useful article for the people who are in begining level in s/w industry.
Its good to consolidate models in one place
Good knowledge provided about SDLC models.
Its really Good one. Explained in simple text with good pictorial representation. Thanks.
Good one. This is what looking for. Explained in simple text with good Graphical representation.
Thanks.
Somasundara Rao
Hi
Its very simple n best to understand the SDLC models btwn can u also include “Fish model” so that all would be at onc place.
Regards
Hi..dude this is a cool one.
Great help for interview preparation!!!!!
THANKS FOR THIS TOPIC THANKS
Hey, it was good overview of the SDLC. But I wonder, should i fit XP and Agile Methodology. If possible, can you please provide some details on that too.
Great Article, thanks
good knowledge provosion to begenners
Good One.Ease is the strength is this article.
THis is very good blog i get while searching on google…
This article explain the SDLC in a very good manner. For the begineers it is a very good article.
Thanks for this article.
Regards,
Veenu kapoor
ITs wondeful, and simple, catchy too
really thanks alot for this topic………
very Informative.
It is very fruitful content
Great Article, thanks
Hi
Raymond Lewallen its really good one,
but iam suggesting its better to eloborate more about the difference between the
high level and low level design under the design phase instead of giving it in one sentence,
over all it is excelelnt
what is the difference between SDLC and Agile methodologies?
Its really good..but if u give in simple english it will be more usefull to all…
Actually the Process is very much easy and adoptable for good output.
this is very good for s/w professtional…
munendra
Good article. Some more categories must be involved like RUP,XP etc.
very useful and a clear explanation of the sdlc models
Thanks…it’s a very good article.It is very important that you have a sound knowledge of software development life cycle if you want to make a software that is good and more cost effective.
Hey I too agree about its importants, i could have been even valuable if he you could have given of all these models.
But i would really appreciate if we can get little more deeper explanation of all these models with one to two examples.
Difference between Waterfall method and linear Sequential method?
Difference between Waterfall method and linear Sequential method?
Hi,
It is a very good article. Thanks for sharing it.
Hey,
You kept everything very simple in this article. Itz a really good summary of different software models commonly used by many software firms.
when i found anather questions ans?
hi,
this is a very good thim. because when you have ans but you donot found then we found heare.
thanks….
its very nice ……
i think it wioll help me in my project work…………
Hi,
Thanks a lot for your vey good article.
Could you throw some light on Iterative, Prototyping, RAD ?
Regards,
- Chandra
its…too good….
Very much helping and quick learning material …. Nice work
very wonderful information.thank youso much
very wonderful information.thank youso much
This was really very helpful. Good information about SDLC. Thanks
Amazing.. thanks
This paper gives me a good explanation about SDLC.
Btw,
Can someone inform me, where I can found a comparison between SDLC used by firms (in US for example)? What is the most popular used SDLC by the firms or software house? Is there any surveys about that?
This paper has given me a clear idea about the SDLC model. In the disadvantages sections, the Risk can be explained clearly about what are the risk factors can be taken into consideration in that particular type of model. Thanks!
Good comprehensive overview! My only suggestion would be to add a Maintenance phase.
Good article. we can refresh very fast our self.
Hi Ray,
Its really a useful thing in brief, Thanks for it.
THANKS FOR SUCH NICE ARTICLE A GOOD RECOLLETION FOR ALL THOSE WHO WANNA A BRUSHUP THANKS AGAIN BYE AND POST OTHER ARTICLES ALSO….
Good, very useful posting. Thanks
Hi!! Thanks a lot .This article is very good & it helped me a lot in deep study of the software lifecycle development models.Thanks again.
hey there extremly well written in an understanding way..ive an exam on theses:) so thanks a miliion.
HI RAY
THIS IS VERY NICE ARTICLE BUT ADVANTAGE -DISADVANTAGE SHOULD BE MORE CLEAR AND EVRY MODEL SHOULD BE EXPLAINED WITH AN EXAMPLE.
this is very good.
thanks a lot.
this is very good.
thanks a lot
this write up is very interesting and educative
was a real important resource for my teaching material.. thanks and keep your work continuing with such important service to all… great work!
Its really good for learners.By the way I need one more help..can any one tell me where I can find the trial version of Test Director
Hi,
A very informative post. Explained in much simpler words and a great help to all developers mostly freshers.
Hey fantastic job. All information in one place. Tanks a Ton.
This article help me a great deal in my project on sdlc models and am just saying thankyou.
NICE ONE ISN’T IT? VERY GOOD INFORMATION TO DISPLAY ANYWHERE IN THE WORLD
THANK YOU FOR RAYMOND LEWALLEN
this is the best description in which i never saw about SDLC
I must give credit to you rlewallen, for supplying such detailed information the various types of SDLC Models. I tell you what, I went for an interview Today for a Test Analyst role some where in London. The face to face interview and all that went well. I was happy. BUT there was the TEST (Combination of Multiple choices and theory). I tell you, if I had seen this blog earlier, I could have earned myself an extra 17 marks for just explining what the V-model was, with the level of clarity you provided. I need to get in touch with you some how.
Please mention the out come documents of each phase of the SDLC!
Nice article, this article is more helpful to the people those who are involved in Testing track
hi, this is gud article but u wrote in a very high manner , please write in simple words nd also in that way tht a student can read it . i m from india . but i found it very nice and optimistic.bye and thanks
Its a really gud article for figuring out differences between different models.
Excellent article. Smart and simple. Summarizes SDLC very well. Good Job.
EXCELLENT AND VERY EASY TO UNDERSTAND, GOOD JOB
Its nice to see these models at one place for reference and comparison for process people. I wanted to see the Extreme Programming & Evolutionary Appraoch models.
— – vsubraya@google.com
hai
this presentation was very good and easily understand any one i hope people send these type of presentations
thanking u
bhumani pradeep
software testing engineer
Good and informative article in short..
Hi,
This was a nice article related to development life cycles. All the models are described in this article to a great extent and the one who reads this article will feel that its definitely good.
very good and interesting……..
Hi,
This was a nice article related to development life cycles. All the models are described in this article to a great extent and the one who reads this article will feel that its definitely good.
very good and interesting……..
Very Good Article and thanks for keeping simplicity.
Thanks for the information, because of this we was able to quickly write up some pointers for our presetasion of Project Management where we need to talk about the importance of the project management and the system lifecycle.
Its a good article and i find sufficient to get knowledge about SDLC.but i would like to know more on prototyping model…
This is a real gud site for the ppl who want to know the basics of how a project is handled btw i doubt if V shaped model is an SDLC . Gud work
Thanks ,
I got solution for my query
thank you for the help
please i want to ask about drawing a sketch of project life cycle
Hi All,
This article is very useful one.Every Software professionals should go through it.
I am trying to decide what sdlc use in my project.
due to lack of expertise cia is strongly considering buy off the shelf software, which would be the best methodology to use if you are going to buy the software?
A good one,but as to be in little more depth for better understanding.keep it up….
Its G8 work.
Thank you for providing these details
Good one …fundamentals of the SDLC ,very useful for someone new to SDLC
Indeed good article throwing light on various SDLC models.
Almost got cleared the imbroglio between various modles.
Thanks a lot
Good One !
I’m doing an assignment at college on System development lifecycles.
This information is very well pressended and is helping me with some of the task that I need to complete in the assignment.
Thank You
Excellent document on SDLC models. I am suggesting you to provide in detail information.
On your question about the v-shaped waterfall
please check this link im only on my HNC/HND of computing but i hope this link helps u along
http://home.att.net/~dwayne.phillips/CutterPapers/vshape/spiral.htm
Thanks for the article. But from my point of view better to elobrate the topic
This is very Nice Article, Thank you very Much. i want to know about Iterative Model.
what are the advantages and Disadvantages.
Thank you very much! it’s useful to me, but do you know novel cycle life? I wish to know any new cyle life used in the present time.
Thank you very much,it’s useful to me.Can you describe the prototyping model?And I donnot understand the difference between the 1st model in incremental model and the prototyping model.
Really this article is very helpful for beginners.I was looking for such article.Thnaks a lot.
Really this article is very helpful for beginners.I was looking for such artical.Thnaks a lot.
Really this artical is very helpful for beginners.I was looking for such artical.Thnaks a lot.
This article is helping me a lot.
Thank You and good work.
Wow u’ve got exactly wat i need.
Common Life cycle models n their advantages n disadvantages.
A very good site. got wat i needed,
Keep up da good wrk.
Hi Ray,
A very good post. I know only waterfall model and worked on that. Now i know a little in other models too.
Thanks
Albert
http://blogs.bepenfriends.com/bepenfriends
for sdlc
fodr sdlc
it very good to better know abut SDLC
a very good article …i need complete information regarding spiral model
thanks to the author.
by the way guys, do u have a Work breakdown structure for these
software life cycle model? i mean, the one that is based from the
ISO12207 standard?
Great article,
Very helpful for me to work on my projects.
The concept of life is very uncertain, you should rethink and go to bed. Maybe some chocolate or you could just leave some pizza for me. I know you love me really.
this is a great article .this realy helped me a lot to clear technical round of my interview. can you please share some information on software testing techniques
This is a great clarification
its good
contains good info
i think they have to give more details
Very informative. Thanks
I find this article better than any SDLC search results till date. Definetly worth your time.
Please what about RAD???? pros and cons
Great Article
can some one let me know what is Rapid Application Development(RAD)
Ka_phin@hotmail.com
I don’t see the UAT in the V-model.Can someone throw some light on this?
Nice article to refresh abt SDLC….Thanks…
to Mr. Lewallen, thank you very much for posting the SDLC, ill be using it for my software methodolgy
Nice Work and very helpful for me in getting differences in all the different models ..
That was really a nice topic, very helpful..
Can anyone help me.. BTW, great article… uhmm what model should i use for this kind of project.. actually its for my thesis… an online expert system that uses schema matching for data warehousing… please help me.. thanks in advance…
Nice work. Very much helpful for me. Thank you
it is very simply and easy to understand .
This site is too good
This is a good material. But, I am not familiar with the V-shaped Life Cycle Model.
Very good article about SDLC.
Very Good
Great article and worth having Five stars. Lot of valuable info presented in succint paras. great.
can u pls discuss about the vv model ?
Excellent material…
Documents seems to be good , our suggestion is to go little bit depth
Documents seems to be good , our suggestion is to go little bit depth
Thank you for sharing this information. I could not get such an information anywhere else.
Hi, This is what I’m looking for. You’re article is very much informative and it helped me in my software engineering course. Thanks a lot.
The Information is Helpful Especially For Basic Learners.Thank You.
Hi. Had there been info about when to use what would have been very much appriciatable . This info is great and useful for most of the S/W engg
Data Provided Is Good,Especially The Pictorial Representation Is Impressive.Thank You.
What hav been explained in wATERFALL Model is not seems to be correct, can u plz check b’coz the requirement shpul be mapped with UAT and rest of them in the same way, on seeing this many would be miss lead so change as soon as possible.
Information is good. But I think this is not enough information. Very less ponints are mentioned.
Advantages&Disadvantages reg models are not clear i suppose.
I feel that General Life Cycle model should be updated.
Thanks for nice postings.Thank u once again.
Srinivas Diyi
Hello
One more question, where does the rational unified process fall in these. Isnt that another type of Software development methodology?
Minal
Hi
This is a great article.
I just have one doubt. I was thinking that wouldn’t Spiral model alos hav the same problem as the Incremental model i.e. “Problems may arise pertaining to system architecture because not all requirements are gathered up front for the entire software life cycle”
In the spiral model, how would you make sure that you have rightly estimated the scope of the project in teh first phase of planning?
Minal
Simply , it is wonderful
Thanks a lot author.
Freshers go through it & enjoy the concepts….
Exactly this entire page gives us clear knowledge on SDLC model. If u need basic knowledge go through it…..
the way you explain concepts is good , you should consider writing more books and articles
.
It’s very helpful to me.Thanks a lot
Very Nice!
Very nice article, you have the gift of putting it in simple terms. Thank you for sharing it.
A few questions ………
Could you please add examples of risks in the softwre context ?
Also can you give examples of requirements changing midstream?
How come they are so?
Thanks so much for such a comprehensive explanation of the SDLC models – Nice overview.
How many life cycle models are applied now a day? The models waterfall and spiral are nolonger used, are they?
I’m a new project manager so I need alot of project management information. I would like you reply my answer to my email box thnhatlinh@yahoo.com
GOOD ONE!!
its really helpfull
Poonam,
Try googling for “v-shaped life cycle”, or some variation thereof.
Angela, that would be Microsoft “Most Valuable Profressional”.
this is eally very nice and helped me in doing the analysis of my project.
what does MVP stands fo in ur name. is it Master of Various Platforms
good article. But i hav never seen a v-shaped life cyle model. where can i get details of this model?
Hi, In lot of interviews iam asked if iam aware of X model or Y model along with V model. Is there something like X model and Y model for SCDL?
hey…this comparision really helped me to understand wot i shud choose for my project…also include rapid prototype model,exteme prgrammig,code n fix and synchronize-stabalize models….thank ya
hey…this comparision really helped me to understand wot i shud choose for my project…also include rapid prototype model,exteme prgrammig,code n fix and synchronize-stabalize models….thank ya
hey…this comparision really helped me to understand wot i shud choose for my project…also include rapid prototype model,exteme prgrammig,code n fix and synchronize-stabalize models….thank ya
hey…this comparision really helped me to understand wot i shud choose for my project…also include rapid prototype model,exteme prgrammig,code n fix and synchronize-stabalize models….thank ya
gud one for beginners !!!!!
Hello all,
I can say Scrum is definitely making headway with a number of Fortune 500 / Global 1,000 companies embracing the values of the http://www.AgileAlliance.org and the http://www.scrumalliance.org
I dug up Kane Mar’s article on staggered iterative waterfall, part1 and part 2 here; I think it is relevant to the discussion:
http://danube.com/blog/kanemar/the_staggered_iterative_waterfall_anti_pattern_part_1.html
and
http://danube.com/blog/kanemar/the_staggered_iterative_waterfall_anti_pattern_part_2.html
Best of luck on your projects.
great work man, keep it up.
hi just wanted to say that I had an assignment that required this information, and your explanation was so simple to understand, this was research we had to do, and I was able to write my assingment better because of you, thanks!!!
ps. yes I didn’t plagerise, I sourced the info
hi Ray
Really its helping alot for who want to know SDLC life cycles.
But wats the difference b/w Extreme programming and other models????
Thanks in advance
I’m working on a project where we’re delivering iterations of the product in phases over four years (one per year).
For our Software Development Plan (SDP), I’m trying to explain how to ensure overlapping test and design phases (test from previous – and design of next phase) don’t lose any changes.
Anyone know of a good document I can check out and/or reference?
Thanks!
- Gerry
Hi,
thanks for ur brief introduction abt SDLC Models.
But i love to see more about V and waterfall models and it’s differences and most commonly used model now a days in industries?.
It will be better and very usefull for begineers.
thanking u
kishore kumar
Brilliant description
I would like more in detail about the differences between high-level design and low-level design. Where can I find them?
Thanks in advance
Nice and very good Jurney about SDLC
thanks for doing my coursework for me maan this is what i needed
kkkkkkkkk
Good one,I’am preparing for my interview and this is what i was looking for. Very simple but explains every thing. Thank you.
Good one!
This article help me a great deal in my project on sdlc models and am just saying thankyou.
it good
umechemsha v shped model haipo vile kabisaaa!
Nice Summary!… Add something about RUP!
adi
very good stuff. wants v-model in details. thaks for stuff
SCRUM is not a super common model, although its certainly going to be in the near future, like many agile models. SCRUM is an incremental/iterative model combination. These types of models are making serious headway into mainstream development and are used by more and more teams everyday.
hey this is good one but what abt new type model scrum used by microsoft mention nothing abt it
good one
Good explanation on models. all people have contributed well to this topic.
Could you tell which model suits a product development project in which the resource skill set is low on ; a new tecnology area ; and technical aspects of development is unaware.
good information regarding the models.can u explain which would be more useful for small projects and big projects.
Raymond, very well explained in a concised manner !! Looking forward to some more comparisons.
compaire between prototype model and linear sequential model
i get all knowledge abt software development life cycle that iwant thanks for your knowledge
Good one. This is what looking for. Explained in simple text with good pictorial representation. Thanks.
Good one. This is what looking for. Explained in simple text with good pictorial representation. Thanks.
Gonzalo,
The XP methodology of software design explains it very well because its an agile model that adapts to change easily. I would start here:
http://www.extremeprogramming.org/rules/iterationplanning.html
to answer your specific questions, and then read through more of the information that you find on the site. That will give you a better view of the approach I support concerning the iterative + incremental SDLC.
Thanks Ray for your clarification.
In that case, which would be the diference between the requirement phase of the first iteration and the following ones? If you are only refining the requirements wouldn’t you be re-working iteration after iteration? On the other hand, how do you carry the planing phase if you don’t know what would come up in the requirement phase of each iteration?
Note that I’m not saying that your approach is incorrect. I’m trying to understand your incremental model more thoroughly.
Kind regards.
Gonzalo,
All SDLC’s have variations to them, and you have stated a variation that McConnell’s opinion is that is a better incremental model. I disagree with his assertion, as you cannot design completely upfront in and in one single phase because its a losing battle. Those requirements and design are going to change, so attempting to do it all at once is a futile process.
I would like to note that according to McConnell’s “Rapid development” book and also “Quality Software Project Manajement” from Software Quality Institute Series, the incremental development life cycle model does not imply that each iteration passes through the requirements, design, implementation and testing phases. They both state that each iteration passes through detailed design, implementation and testing phases. Thus requirements and high level design is done once at the begining.
thanks.
Gurp,
Glad it turned out to be so useful for you! Congrats on your interview and good luck with your job.
this article helps me to crack my interview and i am very thankful to the person who has written such a easy to understand article.
Many thanks for this excellent overview! Very helpful for an Assignment i have to write. Thanks a lot for the post.
thanks very much for ur post
Eddy, I wrote the article and made the nifty little pics. Credit Raymond Lewallen in your bibliography.
Who wrote this artical? if possible to use the pictures, i would like to give credit to the author within my biblography.
This was very informative. In simple words, you explained a lot
Thanks for sharing this with everyone, it really helped me explain system life cycles on my Computing course at uni.
Thanks
p.s. would it be possible for me to use those diagrams?
thanks
Adam
adamh00@hotmail.com
whats the difference between a spiral model and a waterfall model
Hello firends,
I am facing major problem in deciding SDLC for my project.
It is already in ASp I want to Convert it in ASP.NET and C#.
Please send me your choice and supported reasons for that.
With regards
Kunal Aggarwal
kunala@vmoksha.com
I loved this article, it was a great source for my Computer Science cource. Thanks so much!
PS.
Ofcource I sited my resources.
Hi,
This is a kind of article i was looking for, thanks for sharing it with all. This would help in understanding the different SDLC models.
Thanks & Regards,
Santosh Kale
This is a very Good Article That would help to understand Different SDLC Models.
Hi Ray,
This is really a cool and an informative piece of information on sdlc models.
For the incremental picture, you might want to indicate there are multiple incremental flows.
Great overview!
I guess I’ve never seen the V-shaped testing model as an SDLC – but your picture changes the testing model blocks and is interesting. I wonder if High-Level Design should be mapped to Acceptance Testing, Low-Level (Use Case?) to Integration Testing and then break out the Implementation into 3 blocks (Unit Test Design) -> (Implementation) -> (Unit Test Execution). That’s a fairly decent picture to how TDD fits in the picture.
You might want to look at the models called out in Rapid Development: these include Code/Fix, waterfall, staged delivery, design to schedule, evolutionary prototyping, evolutionary delivery, modified waterfall (sashimi), spiral, RUP and Agile. Agile wasn’t listed in the book, but I blogged about Construx’ discussion of it (Construx is owned by McConnell): http://codebetter.com/blogs/steve.hebert/archive/2005/07/13/129119.aspx
-Steve
XP is iterative *and* incremental (like RUP and essentially all modern processes). Barry Boehm’s old spiral model is only iterative. It’s actually a significant difference.
Hey Ray,
This is a good post, but for some reason it isn’t appearing in aggregators.
Secondly, isn’t extreme programming very similar to the spiral model? Just a few new bells whistles and buzz words !!!
- SM