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Softwares are products which are designed and developed to work on the operating systems. But nowadays, some softwares are compatible only with the latest version of the Os and it fails to run in the older ones. This is because the older versions of the operating system are not able to understand the architecture of the software. So we conducted a survey on this problem. Nearly 300 IT professionals attended the questionnaires and the factors were identified. So from the Matrix model of calculating the software usability, the factors mentioned by the IT professionals are included and then calculated. As a result of these calculations, new factors are included in the existing matrix model and the resulting matrix is our proposed model. In this paper we discuss about the formation of the model, result of the model and how this architectural model is advantageous over the existing model. The results derived as graphs were obtained by using a graphical simulator specially designed for this research work. [ABSTRACT FROM AUTHOR]

Use case refactoring is one of the recent software engineering techniques that aimed at synthesising and refine use case models. Two new types of use case refactoring are proposed in this paper. First, behavioural refactoring aimed at synthesising the presentation and understanding of the described services. Second, structural refactorings aimed at refining and simplifying the different relationship between the following pairs: (1) concrete and abstract use cases, and (2) use cases and actors. The application of the proposed refactorings on a real use case model showed that the advantages of use case refactorings are not limited to the target use case models only, but on their relationships with other software engineering artefacts. These include the facilitation of the extraction and utilisation of (1) use case patterns, (2) software metrics, and (3) software cost estimates from use case models. Further work is being carried out to automate the process of use case refactoring and integrate it with the underlying software development process. [ABSTRACT FROM AUTHOR]