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  Prototyping Methods and Tools

Introduction to Prototyping Methods and Tools

For software prototyping to be effective a prototype must be developed rapidly so that the customer may assess results and recommend changes. To conduct rapid prototyping, three generic classes of methods and tools are available:

Fourth Generation Techniques (4GT)

Reusable Software Components

Formal Specification and Prototyping Environments

Fourth  Generation Techniques :  Fourth  generation  techniques  encompass  a broad array of database query and  reporting languages, program and application  generator s, and other very  high level non procedural languages. Because 4GTs enable the software engineer to generate executable code quickly they are ideal for rapid prototyping. Although the application domain for 4GTs in currently limited to business information systems. Tools for engineering application are beginning to emerge.

Fourth Software Components: Another approach to rapid prototyping is to assemble rather that build the prototyping by using a set of existing software components. A software component may be a data structure (or database) or a software architectural components (i.e. a program) or a procedural components (I. e. Module). In each case, the software component must be designed in a manner that enables it to be reused without detailed knowledge of its internal workings.

Melding prototyping and program components reuse will work only if a library system is developed so that components that do exist can be catalogued and then retrieved. Although a number of tools have been developed to meet this need much work remains to be done with in area.

Formal Specification  and Prototyping Environments : over the past two  Decades a number of  formal  specification languages and tools   have been  developed    as a replacement for  natural language specification  techniques . Today developers of these formal languages are in the process of developing interactive environment that:

Enable an analyst to interactively create language based specification of a system or software.

Invoke automated tools that translate the language based specification into executable code.

Enable the customer to use the prototype executable code to refine formal requirements.

Specification language  such PSL, RSL, IORL, GYPSY, OBJ,  and many  other are being coupled to interactive environments  in an effort to achieve an automated software  engineering paradigm  as shown in fig 3.10.

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Although still in their early stages of development and application such environments offer substantial hope for improved prototyping and software productivity.

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