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Design and realisation of a knowledge base

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par Sawssan SELMI
 - Ingénieur en informatique 2011
  

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Fig1. Waterfall model

1.5.2 V-cycle model
This model is an improved cascade model that limit return to previous steps in case of anomalies. To enhance the software functionalities the phases of the rising part, must submit information on the phases in other side when errors are detected.
Further more, the V cycle highlights the need to anticipate and prepare in stages down the "expected" of future steps rising: as expected the validation tests are defined in the specifications, the expected unit tests are defined in the design.

It helps us to manage and coordinate acceptance testing activities, test defect management, test plan preparation and following clients' project requirements.

The benefits of performing verification and validation activities:

§ Improved software quality

§ Improved customer satisfaction

§ Reduced cost of development

§ Reduced cost of maintenance

Verification and validation activities are performed at every stage of the software development lifecycle as depicted by the V-model below;

Fig2. V-cycle model

1.5.3 Spiral model

This development describes the various stages of the V cycle. By implementation of successive versions, the cycle starts by proposing more full and hard product. 

The spiral cycle emphasis risk management than V-cycle indeed, the beginning of each interaction includes a risk analysis phase.

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