Abstract: The article analyzes the shortage of C&K software metrics suit for an improvement, then proposes a decomposed coupling metrics for objected-oriented (DCMOO). The metrics refer to unified modeling language class diagram to analyze the relationships between classes in software design, and evaluate the quality of the software by using a set of formal evaluation theorems, It is shown that DCMOO can satisfy these theorems. Finally the article uses JUnit and JEdit as research object, and applies DependencyFinder and Eclipse Metrics to calculate the proposed software coupling metrics automatically meanwhile validate the proposed metrics.

Key words: C&K metrics suit, software quality, software coupling metrics, unified modeling language class diagram