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The spiral model i¢ cimilar to the incremental model, with more emphasi¢c placed on rick analycic. The cpiral model has four phases: Planning, Rick Analysis, Engineering and_ valuation. oftware project repeatedly passes through these phases in iterations (called Spirals in thic mode/). _The baseline spiral, starting in the planning phase, requirements are gathered and rick _is assessed. Each subsequent spirale builds on the baseline spiral. [tc one of the coftware development modele like Waterfall, Agile, V- Model. PHASES 2> Planning Phase: Requirements are gathered during the planning phase. Requirements like BRO’ that ic Bussiness Requirement Specifications’ and "CR&" that ic ‘Cyctem Requirement specifications. isk Analysis: Tn the rick analysis phase, a process is undertaken to identify rick and alternate solutions. A prototype ic produced at the end of the rick analysis phase. Tf any rick ic Found during the rick analysic then alternate colutione are cuggected and implemented. 2> Engineering Phase: In thio phase coftware i¢ developed, along with testing at the end of the phase. Hence in this phase the development and tecting ic done. >> Evaluation phase: This phase allows the customer to 
