Find alternate solutions possible 71 Risk Assessment and Reduction Second

Find alternate solutions possible 71 risk assessment

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Find alternate solutions possible.
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71 Risk Assessment and Reduction (Second Quadrant) For each identified project risk, a detailed analysis is carried out. Steps are taken to reduce the risk. For example, if there is a risk that the requirements are inappropriate: a prototype system may be developed.
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72 Spiral Model (CONT.) Development and Validation ( Third Third quadrant quadrant ): develop and validate the next level of the product. Review and Planning ( Fourth quadrant Fourth quadrant ): review the results achieved so far with the customer and plan the next iteration around the spiral. With each iteration around the spiral: progressively more complete version of the software gets built.
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Spiral Model as a Meta Model Subsumes all discussed models: a single loop spiral represents waterfall model. uses an evolutionary approach -- iterations over the spiral are evolutionary levels. enables understanding and reacting to risks during each iteration along the spiral. Uses: prototyping as a risk reduction mechanism retains the step-wise approach of the waterfall model.
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74 Comparison of Different Life Cycle Models Iterative waterfall model most widely used model. But, suitable only for well-understood problems . Prototype model is suitable for projects not well understood: user requirements technical aspects
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75 Comparison of Different Life Cycle Models (CONT.) Evolutionary model is suitable for large problems: can be decomposed into a set of modules that can be incrementally implemented, incremental delivery of the system is acceptable to the customer. The spiral model: suitable for development of technically challenging software products that are subject to several kinds of risks.
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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 . 76
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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. 77
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When to use Spiral model: When costs and risk evaluation is important For medium to high-risk projects Long-term project commitment unwise because of potential changes to economic priorities Users are unsure of their needs Requirements are complex New product line Significant changes are expected (research and exploration) 78
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