An investigation into coupling measures for C++
ICSE '97 Proceedings of the 19th international conference on Software engineering
A Unified Framework for Coupling Measurement in Object-Oriented Systems
IEEE Transactions on Software Engineering
A Metrics Suite for Object Oriented Design
IEEE Transactions on Software Engineering
A model of large program development
IBM Systems Journal
A coupling framework for aspectJ
EASE'06 Proceedings of the 10th international conference on Evaluation and Assessment in Software Engineering
A Longitudinal Study of Fan-In and Fan-Out Coupling in Open-Source Systems
International Journal of Information System Modeling and Design
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Objective. To explore whether an 80:20 rule exists in Java from six coupling metrics over multiple versions of open-source software and, if so, whether that relationship is exacerbated over time. Methods. We used the automated tool JHawk to extract the 6 different coupling metrics from four Open-Source Systems. We then ranked the classes on each of these 6 coupling metrics and then analysed the top 20% of classes to see whether 80% of total coupling was contained therein. Conclusions. Only one metric appeared consistently to have an 80:20 relationship and that was the 'fan-in' metric. Evidence suggests that fan-in and fan-out have a complementary relationship. We found many of the other metrics had few, if any such relationships. The RFC was typical in this sense - no 80:20 relationship was found in any of the systems or any version in those systems. We also found no evidence to support the view that over time, the 80:20 is exacerbated.