V-Model - Advantages and Disadvantages

V-Model / VV-Model:

(Verification and Validation Model)

• In V-Model, at every stage we have testing.

• Static Testing:

Testing the project related documents is called as Static Testing.

- Review, Walk-through and Inspection are the Static testing techniques to verify the documents.

White Box Testing Techniques - Programming knowledge is required.

-> White Box Testing Techniques are Unit Testing and Integration Testing.

Unit Testing:

- Testing the single module.

- Developer conducts this testing.

Integration Testing:

- Developer conducts this testing.

- Testings conducted on code.

Black Box Testing Techniques - Programming knowledge is not required.

-> Black Box Testing Techniques are System Testing and User Acceptance Testing (UAT).

System Testing:

- Testers involved in this phase.

- No need to understand the code.

User Acceptance Testing (UAT):

- Conducted by Testers and Users.

Dynamic Testing:

- Testing the actual software.

Techniques:

• Unit Testing.
• Integration Testing.
• System Testing.
• User Acceptance Testing.

Static Testing:

- Testing the documents.

Techniques:

• Review.
• Walk-through.
• Inspection.

Verification and Validation

Verification:

- Checks whether we are building the right product or not.

- Focus on documentation.

- Verification typically involves -> Reviews, Walk-through, Inspection and Static testing techniques.

Validation:

- Checks whether we are building the product right or not.

- Focus on software.

- Verification typically involves actual testing.

- Takes place after verification's are completed.

- Dynamic testing techniques.

Advantages of V-Model:

- Testing is involved in each and every phase.

Disadvantages of V-Model:

- Documentation is more.

- Initial investment is more.

Static testing techniques:

1. Review

2. Walk-through

3. Inspection

Review: -> Conducts on documents to ensure correctness and completeness.

- Requirement reviews.

- Design reviews.

- Code reviews.

- Test plan reviews.

- Test cases reviews..

Walk-through: -> Informal reviews.

- It is an informal review, without any plan or schedule.

- Author reads the documents or code and discuss with peers.

- It is not preplanned and can be done whenever required.

- Also walk-through doesn't have minutes of the meet.

Inspection: -> It is a most formal review type.

- In which at least 3-8 people will involve in this meeting. 

- Inspection will have a proper schedule which will be intimated via email to the concerned developer/tester.