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SDLC Interview Questions and Answers

Ques 6. Briefly describe the phases in the waterfall model.

Ans. Requirements gathering: All the requirements are gathered and analysis is performed for the complete system.
Design: Various design models are created for the complete system after the requirements gathering phase has been completed and ended.
Implementation: The complete system is implemented once the design for the system has been frozen.
Testing: The complete system is tested after all the construction and integration has completed.
Maintenance: Post implementation support carries out after implementation of the system. 

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Ques 7. Explain the strengths of the waterfall model.
Ans. Strengths of the waterfall model are:
a) No planning needed
b) Works well for small projects with fixed and clear requirements.
c) Lesser cost as planning overhead is less
d) Quickest delivery of the complete system 
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Ques 8. Explain the weaknesses of the waterfall model.

Weaknesses of waterfall model are:

a) It is Inflexible
b) Accommodating changes is very hard
c) Longest tangible delivery time. The customer does not see anything but the whole product when itís ready.
d) Unsuitable for large projects and where requirements are not clear. 

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Ques 9. Explain when to use the waterfall model.
Ans. One should use the waterfall model only when:
  • Requirements are very clear and fixed.
  • There are no ambiguous requirements.
  • Ample resources with required expertise are available freely.
  • The client has high confidence in the organization.
  • The organization has experience of similar projects.
  • The project is short.
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Ques 10. Describe V-Shaped software development life cycle model.

The V-shaped SDLC model is an extension of the waterfall model. The typical waterfall moves linearly downwards, whereas, in V-shaped model phases are turned upwards after coding phase to form the V shape. It demonstrates relationship between each phase of SDLC and its respective testing phase. Unlike waterfall model, the V-Shape includes early test planning.

Requirement analysis---------------------------------------Acceptance testing
              System design------------------------------------System testing
               Architecture design -----------------------------Integration testing
                            Module design----------------------------Unit testing

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