Abstract

This chapter addresses the question of what constitute a good design. A design is essentially a plan to bring about a man-made artifact. There are two facets of the quality of a design. The first is the quality related to the product it brings about. The second is the quality related to the process of bringing about the product. These two facets are closely related. Quality can be measured by a number of quality attributes or inherent characteristics of the product. Ideally, these quality attributes should reflect users' views of quality and reflect the value of the product and the quality of manufacturing. This chapter focuses on the quality of software systems. There are a great number of quality attributes identified for software products. These quality attributes are often classified into a hierarchical structure to highlight the relationship between them. Software quality must be addressed during the whole process of software development. Design is the first stage in software system creation in which quality requirements can begin to be addressed. Errors made at this stage can be costly, even impossible, to be rectified. Design decisions have significant effects on the quality of the final product. Software design tasks can be divided into several interrelated subtasks such as architectural design, interface design, and detail design including algorithm and data structure design.

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