What is V-model and advantages and disadvantages of this model

What is V-model ?

– V- model means Verification and Validation model.
– Each phase must be completed before the next phase begins.
– Testing of the product is planned in parallel with a corresponding phase of development.

V- Model Design and Flow-

V model has the different phases as shown in the above diagram.

Advantages of V-model:

  • Simple and easy to use.
  • Testing activities like planning test designing happens well before coding. This saves a lot of time. Hence higher chance of success over the waterfall model.
  • Proactive defect tracking – that is defects are found at early stage.
  • Avoids the downward flow of the defects.
  • Works well for small projects where requirements are easily understood.

Disadvantages of V-model:

  • Very rigid and least flexible.
  • Software is developed during the implementation phase, so no early prototypes of the software are produced.
  • If any changes happen in midway, then the test documents along with requirement documents has to be updated.

 

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What is Spiral model and what is advantage and disadvantage of this model?

What is Spiral model?

  • Spiral model is a combination of sequential and prototype model.
  • This model is best used for large projects which involves continuous enhancements.
Spiral Model design and flow-

The spiral model has four phases.

  1. Planning phase
  2. Risk analysis phase
  3. Engineering phase
  4. Evaluation phase.

1. Planning Phase:

  • Requirements are gathered and analysis.
  • Doing feasibility study
  • Developed the Requirements like ‘BRS’ that is ‘Business Requirement Specifications’ and ‘SRS’ that is ‘System Requirement specifications’.

2. Risk Analysis:

  • To identify risk and alternate solutions.
  • If any risk is found during the risk analysis then alternate solutions are suggested and implemented.

3. Engineering Phase:

  • Development and testing of the software takes place in this phase.

4. Evaluation phase:

  • Customers evaluate the software and provide their feedback and approval

SDLC-Spiral-Model-1

Advantages of Spiral model:

  • High amount of risk analysis hence, avoidance of Risk is enhanced.
  • Good for large and mission-critical projects.
  • Strong approval and documentation control.
  • Additional Functionality can be added at a later date.
  • Software is produced early in the software life cycle.

Disadvantages of Spiral model:

  • Can be a costly model to use.
  • Risk analysis requires highly specific expertise.
  • Project’s success is highly dependent on the risk analysis phase.
  • Doesn’t work well for smaller projects.