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It is a process of creating systems, and methodologies and models that people use to develop software...
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SDLC serves as a guide to the project and provides a flexible and consistent medium to accommodate changes...
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An SDLC model defines implementation of an approach to the project. It defines the various processes.....
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Waterfall is a sequential and non iterative SDLC model which describes flowing of phases downwards one by one.....
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Requirements gathering, Design, Construction, Integration, Testing, Implementation, Maintenance.....
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Strengths of the waterfall model are: a) No planning needed....
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Weaknesses of waterfall model are: a) It is Inflexible b) Accommodating changes is very hard......
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One should use the waterfall model only when: Requirements are very clear and fixed.......
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The V-shaped SDLC model is an extension of the waterfall model. The typical waterfall moves linearly downwards....
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Phases in V-Shaped model: Verification phases are on the left side of the V-shape. It consists of:...
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Strengths of V-Shaped model: a) Simple and easy to use model....
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Weaknesses of V-Shaped model: a) It is inflexible....
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The V-shaped model should be used for small to medium sized projects where requirements are clearly defined and fixed...
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Prototype SDLC models is based upon creation of a software prototype of the complete system....
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Phases in prototype model: Identify some requirements to begin with: Get a list of some major requirements which define the need for the new system including the main input output information...
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Strengths of prototype model are: a) Gains customer’s confidence as developers and customers are in sync with each other’s expectations continuously....
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Weaknesses of the Prototype model are: a) Focusing on the prototype can mislead developers from understanding the actual desired system......
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Prototype model should be used when the desired system needs to have a lot of interaction with the end users.....
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RAD involves iterative development along with creation of prototypes. It uses interactive use of techniques and prototypes....
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Phases in RAD: Business modeling, Data modeling, Process modeling, Application generation, Testing and turnover.....
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Strengths of RAD: a) Reduced development time. b) Increases reusability of components...
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Weaknesses of RAD: a) Depends on strong team and individual performances for identifying business requirements.......
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RAD should be used when there is a need to create a system that can be modularized in 2-3 months of time.....
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Incremental SDLC approach suggests construction of a partial system rather than the complete system and then builds more functionality into it.....
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Phases of incremental model are same as waterfall i.e. Requirements, design, implementation, testing, maintenance....
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Strengths of incremental model are: a) Develop high risk business features first....
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Weaknesses of incremental model are: a) Needs good planning and design......
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Incremental model should only be used when: Requirements of the complete system are clearly defined and understood....
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The spiral SDLC model combines components of both design and prototype in phases. It’s a hybrid of waterfall and prototyping model....
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Phases in spiral model: a) System requirements are identified in detail. b) An initial design is created for the new system based on the requirements in previous phase......
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Strengths of the Spiral model: a) Early identification of potential risk areas. b) Customer sees a prototype very early in the SDLC....
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Weaknesses of Spiral model are: a) Not suitable for smaller or low budget projects as cost is high for identifying risks....
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Spiral model should be used when: a) Prototypes are expected/needed b) Large and high budget projects...
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There is no specific SDLC model that can be used for all types of projects and situations. If none of the popular SDLC models suit for a specific project....
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