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Module 4: Software Testing

20217m

What are the main objectives of software verification and validation? Explain different verification and validation techniques.

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Solution

Verification vs Validation

Aspect Verification Validation
Question Are we building product right? Are we building right product?
Checks Against design/specs Against user needs
When During development After development

Objectives

  • Ensure correctness, completeness, consistency
  • Detect defects early, reduce cost

Techniques

Verification (Static):

  1. Reviews - Informal, Walkthrough, Peer review, Inspection (Fagan)
  2. Static Analysis - Code analyzers, data flow analysis
  3. Formal methods - Mathematical proof

Validation (Dynamic):

  1. Testing - Unit, Integration, System, Acceptance (Black/White box)
  2. Prototyping & Simulation
  3. Alpha/Beta testing with users

V&V together ensure quality throughout SDLC.

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