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Redesigning of an existing software using design patterns

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3 Author(s)
Masuda, G. ; Div. of Med. Inf., Osaka Med. Coll., Japan ; Sakamoto, N. ; Ushijima, K.

We describe a case study on redesigning of existing software using design patterns. Although design patterns have spread widely in object-oriented software design, the disordered application of them often makes the design more complicated or worsens performance. In the case study, we introduce a hot-spot based approach to apply design patterns effectively. Then we quantitatively evaluate the effectiveness of applying design patterns to the redesigning. The C&K metrics suite is used for the evaluation. We collect C&K metrics values for two versions of the decision tree learning system. One is a prototype version designed without using design patterns while the other is redesigned using design patterns. We conduct the Mann-Whitny U-test, one of the nonparametric statistics for testing hypotheses about whether two sample values differ. As a result, we find significant differences between the C&K metrics values of the two versions. Finally we discuss the applicability of the C&K metrics to criterion for evaluation of the flexibility and extensibility of software

Published in:

Principles of Software Evolution, 2000. Proceedings. International Symposium on

Date of Conference:

2000

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