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SDLC Interview Questions and Answers

Ques 26. Briefly describe the phases in the Incremental model.

Phases of incremental model are same as waterfall i.e. Requirements, design, implementation, testing, maintenance. However, instead of following the waterfall once and for all linearly, incremental model takes a different approach. In this phases are repeated incrementally as business value is delivered incrementally as well. 
For every single phase and increment a waterfall model is followed. The waterfall model is then put in a cycle of increments along with verification of requirements, and design. 

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Ques 27. Explain the strengths of the Incremental model.

Strengths of incremental model are:

a) Develop high risk business features first
b) Every increment delivers an operational product
c) Customerís confidence is high as they validate every increment and provide feedback
d) Low initial delivery cost
e) Changes in requirements can be accommodated for easily.
f) More flexible than waterfall. 

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Ques 28. Explain the weaknesses of the Incremental model.

Weaknesses of incremental model are:
a) Needs good planning and design.
b) Needs a clear and complete definition of the complete system before it can be broken down and built incrementally.
c) Integration needs are very high
d) Total cost is higher than waterfall. 

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Ques 29. Explain when to use the Incremental model.

Incremental model should only be used when:
Requirements of the complete system are clearly defined and understood. 
Major requirements must be defined; however, some details can evolve with time. 
There is a need to get a product to the market early.
A new technology is being used
Resources with needed skill set are not available
There are some high risk features and goals. 

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Ques 30. Describe spiral software development life cycle model.

The spiral SDLC model combines components of both design and prototype in phases. Itís a hybrid of waterfall and prototyping model. One should use spiral SDLC model for large and expensive projects. 

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