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''\444i\ " ~A 9,"--897

The so-called 'software crisis' has led to a search for more productive methods of software development. Improvements in areas such as software tools, modern programming practices, new computer languages, and personnel capability have been inadequate to meet the needs of today's systems. Software productivity improvements of an order of magnitude or more may be possible through the use of reusable software. The use of a software components catalog from which software parts could be assembled was proposed over twenty years ago. Practical application of these concepts has been limited to a few demonstrations in selected application areas. Some critical software measurement issues must be addressed before software reuse can become a reality. This paper examines a variety of measures for software, shows why the physical properties of software are important for determining reuse potential, and provides design guidelines for the structuring and analysis of software to enhance its reusability.

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