Many attempts were made to address the shortcomings of the waterfall approach, such as the spiral model of software development defined by Barry Boehm in 1988. Intended for use in large,complex,and costly projects, and intended to address the issues of meeting customer requirements,this incremental development process relied heavily on the development and testing of a series of software prototypes of the final system. The typical steps involved in a spiral model–driven project are as follows:
_ test the strengths and weaknesses of the prototypes,and to highlight any risks;
assist in refining the requirements by obtaining customer feedback;and
_ assist in refining the planning and design.
Graphical Overview of the Spiral Model.
Although considered to be an improvement over the waterfall approach in terms of delivering systems that more closely match the customer’s requirements, and for delivering higher-quality software(achieved in large part by the spiral model, which encourages early and continued testing of the prototypes), issues existed regarding the difficulty of estimating effort,timescales, and cost of delivery;the nondeterministic nature of the cycle of prototype development and testing meant that it was difficult to bound the duration and effort involved in delivering the final product.
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