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Part III. Appendix 5: System Engineering ApproachTable 2. System Engineering comparison of Waterfall, Rapid Prototype, and Spiral ModelsWaterfall Model Rapid Prototype Model Spiral ModelPro Pro ProDocumentation Allows frequent changes Risk analysis preceding each phaseMaintenance easier Helps define user requirements Allows for changing requirementsQuality product at finish Rapid return on investment Allows prototypingCon Con ConSpecification document Increased maintenance costs Once risk cannot be mitigated theproject is terminatedHave to get it right first time How do you know you are finished? Not effective for large-scale projectsDoes not allow for prototype Build-and-fixTime consumingCostlyHard to accommodateDoesn’t accommodate newrequirementsFigure 3. System Integration Cycle for the Spiral Model279