Introduction
The major goal of Software Engineering is to produce ‘Quality’ Software that meets the user’s needs. Software quality is defined as “an effective software process applied in a manner that creates a useful product that provides measurable value for those who produce it and those who use it”. (Pressman 2010: 400) For quality software to be designed, the problem must be understood, requirements gathered in order to produce a high-quality software solution, which must contain all the functional features that are required by the end user.
McCall (1977) developed a Software Quality model which is vital to obtain data to improve the performance of a piece of software. The McCall quality model defines and identifies the quality of a software product by addressing the three perspectives, product operation; the ability of the product to be easily understood and operated to produce the required results of the user, product revision; the ability of the software product to undergo changes which include error correction, flexibility, system adaptation, product transition; the ability of the software to adapt to new environments and adapt to rapidly changing hardware (Jamwal 2010). The model gives a relationship between Software Quality Factors and Metrics used to quantify the quality of software. Software Quality factors represent attributes or characteristics of software that a user would use to relate or determine the overall quality of a piece of software. While Software metrics provide a means to measure the degree to which the quality factor attributes are met. McCall (1977) identified 11 quality factors which relate to 23 metrics. These quality factors relate to at least one metric. For example, maintainability which is the degree to which errors can be identified and fixed in operational software can measure by consistency, simplicity, conciseness, modularity...