A prototype-based software development can complement or offer an alternative to traditional system development techniques. Software prototyping approaches are becomin.1 more sophisticated and systems prototyping tools and techniques are rapidly evolving. This paper presents a survey of graphical and textual software prototyping approaches. We dwell on the respective represt ntations, methods, and benefits.We give examples of !ypical software tools available to carry out system prototyping. A taxonomy of prototyping approaches i s liven.
Application specific scenarios are used to develop a system's requirements-specification document and then iterate through the software development lifecycle. A seamless object-oriented approach is presented, suitable f o r the development of large real-tim.e systems. It starts with requzrements-analysis and specifications definition. It then iterates through the design, implementation, and test phases. The items of interest in each phase of the lifecycle are the same: Scenarios and objects. This is the basis of maintaining tracability and conceptual integrity. The approach is intended to be simple, maintain high quality, and thereby reduce lifecycle cost. The advantage of a scenariobased method is that scenarios make 'communications' easier. A PBX telecommunications example demonstrates the practicality of the method.
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