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SDLC Interview Questions and Answers

Ques 11. Briefly describe the phases in the V-Shaped model.

Phases in V-Shaped model:
Verification phases are on the left side of the V-shape. It consists of:

Requirements analysis: Requirements are gathered and analysis is performed to understand the problem and propose a solution.
System Design: Engineers analyze the requirements gathered and propose ways the system can be created or built from a feasibility point of view.
Architecture design: Architecture of the system is designed consisting of various modules, depicting their relationships and communication between them. 
Module design: This is a low level design where modules are designed individually and in a detailed manner.

Coding: This is at the bottom of the V-Shape model. Module design is converted into code by developers.

Validation phases are on the right side of the V-shape. It consists of:
Unit testing: Testing by analysis of the code by developers for their independent modules is done.
Integration testing: Independent modules are tested together to validate interface and expose errors in them.
System testing: The system is tested against the system specifications.
User Acceptance testing: Testing is performed by end users to validate that the requirements mentioned in requirements phase have been met by the system or not before accepting it for production. 

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Ques 12. Explain the strengths of the V-Shaped model.

Strengths of V-Shaped model:

a) Simple and easy to use model.
b) Every phase has clear and fixed deliverables.
c) Higher chances of success as test planning starts early in the SDLC cycle.
d) Quickest for project where requirements are fixed and clearly defined. 

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Ques 13. Explain the weaknesses of the V-Shaped model.

Weaknesses of V-Shaped model:
a) It is inflexible.
b) Changes in requirements are very hard to accommodate
c) No early prototypes are available
d) Needs ample skilled resources. 

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Ques 14. Explain when to use the V-Shaped model.

The V-shaped model should be used for small to medium sized projects where requirements are clearly defined and fixed. The model accommodates more planning for test than waterfall but makes accommodation of changes harder than other models. The V-Shaped model should be chosen when ample technical resources are available with needed technical expertise. Since, no prototypes are produced, there is a very high risk involved in meeting customer expectations, therefore, confidence of customer should be very high in order for choosing the V-Shaped model approach. 

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Ques 15. Describe prototype software development life cycle model.

Prototype SDLC models is based upon creation of a software prototype of the complete system and then refine and review it continuously till the complete acceptable system is built. 

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