A Comparative Examinati on of Systems Analysis Techniques*

The systems industry has now experienced al most three decades of growth and development. In that period, a 1 arge number of analysis tools and techniques have been proposed to aid the development process. Early systems were supported by analysis techniques which had been used for some time in precomputer systems. Next, the precomputer techniques \u27were modified to meet some of the unique requirements of computer based systems. Succeeding generations of analysis tools continued to provide improved support to the analysis process. In recent years, a series of structured analysis tools and techniques has been introduced to the industry. At this point, a large number of competing analysis techniques exist and are widely used. However, they are not cl early understood by many practici ng professi onal s. They tend to be i ncompl ete, requi ri ng careful eval uation and integration to result in coherent analysis processes. Unfortunately, the 1 iterature on the subject tends to concentrate on the strengths of individual tool s, often implying that a single analysis process can address all needs. In reality, all analysis tools and techniques are incompl ete. While specific approaches provide support for specific analysis problems, none cover all of the system issues of interest. Traditional techniques tended to provide good detail on input and output detail. In addition, traditional analysis approaches cl arified flows of information through the organization. Later approaches considered data storage and provided tool s to represent procedural system aspects. Structured techniques concentrate on the structure of data fl ows, data, and control . Unfortunately, modern analysis approaches exhibit improvements in some areas of analysis while neglecting some of the strengths of older techniques. This paper presents a comparative examination of analysis techniques to aid practicing professionals in the choice of tool s for devel opment efforts. The comparison i s supported by a set of dimensions which represent the various syste