Waterfall model, Spiral Model,RAD ( Selecting a SDLC for project)

When, why ,where are these models used and in what circumstances ?
Waterfall Model:-
a:-Usually in service based company this model is used as people who work will not be there permanent  so they need lot of documentation who,what they do in project so that later people who replace should understand.

b:- For each stage they need lots of approval and concurrence from SA , Higher exp person for any changes in system or software. Lot of developers and people needs to move in and out on regular basis . 

Spiral Model:- This is a beautiful model which tells risk of all phases and will give small model output every stage of LifeCycle.

RAD:- This is usual practice by young and enthusiastic developers who try new things in a rapid way who is least worried of documentation and give output soon.

When project comes SA or ITA or those who have higher view of the system they understand the severity and impact of the change in whole system based on that they decide which model needs to be applied with best result. But all organisation will follow some standards SDLC but based on problem / project its modified internally and make sure all are in company CMMI standards . 

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5 thoughts on “Waterfall model, Spiral Model,RAD ( Selecting a SDLC for project)

  1. msritse2012 November 26, 2012 at 5:34 pm Reply

    You have mentioned where waterfall, spiral,RAD models are used but failed to mention what are these models?

    • msritse2012 November 27, 2012 at 5:28 am Reply

      You can refer various papers . I have posted only a brief idea or higher view point of all models . If you want what they mean please refer Google you can get all details
      By Amit

  2. Khaja Moinuddin November 26, 2012 at 6:29 pm Reply

    you did not gave when to use spiral and RAD models.

  3. Khaja Moinuddin November 26, 2012 at 6:34 pm Reply

    RAD Model is used when the customer wants the software to be developed as soon as possible and the he dose not care about the cost. a that time by the use of large man power they solve the problem. But i want to know when should we use spiral model

  4. msritse2012 November 27, 2012 at 1:02 pm Reply

    How can we came to know that which model to prefer under which circumstances?

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