By

Ankita Dubey

C-DAC, Mumbai

Outline • Overview

• V-models for software

• Testing

• Testing during Coding

• VV Model

• Critical roles and responsibilities

• References

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Overview • The V - model is SDLC model

• Execution of processes happens in a sequential

manner in V-shape.

• Also known as Verification and Validation model.

• Extension of the waterfall model

• Based on association of a testing phase for each

corresponding development stage.

• Highly disciplined model and next phase starts only

after completion of the previous phase.

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V Models for software

problem

reqs specification

requirements engineering

design

design

implementation

system

testing

working system

maintenance

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V-Model for Software

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V Model

• Structured approach to testing

• Activities during each phase of SDLC

• Analyze structures produced during development phases for adequacy and testability

• Generate test sets based on structures

• Additional activities during design and coding

• Determine that structures are consistent with previously generated structures

• Refine and redefine test sets generated earlier

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Testing

• Testing during

proposal stage

• Testing during

requirement stage – Adequate

– Clear/ unambiguous

– Verifiable / testable

– Measurable

– Feasible

– Not conflicting with

each other

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Contd.. Testing during Test Planning phase

– Generate test plan to support development activities

– Generate test cases based on system structure

– Analyse requirement/ design coverage

Testing during design phase

– Consistency with respect to requirements

– Analyze design for errors

– Analyze error handling

– Developers verify information flow and logical structure

– Testers inspect design in detail

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Contd.

Aspects to be checked

– Missing test cases

– Faulty logic

– Module interface mismatch

– Data structure inconsistency

– Erroneous input/ output

– User interface inadequacies

– Correctness of decisions and conditions along all paths

– Inconsistency with respect to requirements and high

level design

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Testing during Coding

• Aspects to be checked

– Coding standards / guidelines

implementation

– Coding optimization

– Code interpreting design

– Unit testing

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VV model • Requirements

– Requirements verification

– Requirement validation

• Design

– Design verification

– Design validation

• Coding

– Coding verification

– Coding validation

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Critical roles and responsibilities • Development

– Project planning

– Resourcing

– Customer and stakeholder

interaction

– Define policies and procedures

– Support development team

– Do development activities

• Testing

• Test planning

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Contd..

• Resourcing – Customer and stakeholder

interaction

– Define policies and procedures

– Support development team

– Do acceptance testing

• Customer – Specify requirements

– Participating in acceptance testing

– Review and approve artifacts

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References

• Wikipedia of V-Model (software development)-

https://en.wikipedia.org/wiki/V-

Model_(software_development)

• SDLC v-model -

http://www.tutorialspoint.com/sdlc/sdlc_v_model.htm

• Advantages and Disadvantages of V-Model -

http://istqbexamcertification.com/what-is-v-model-

advantages-disadvantages-and-when-to-use-it/

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THANK YOU

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