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<p>A study of the relationship between the cyclomatic complexity metric (T. McCabe, 1976) and software maintenance productivity, given that a metric that measures complexity should prove to be a useful predictor of maintenance costs, is reported. The cyclomatic complexity metric is a measure of the maximum number of linearly independent circuits in a program control graph. The current research validates previously raised concerns about the metric on a new data set. However, a simple transformation of the metric is investigated whereby the cyclomatic complexity is divided by the size of the system in source statements. thereby determining a complexity density ratio. This complexity density ratio is demonstrated to be a useful predictor of software maintenance productivity on a small pilot sample of maintenance projects.</p>
cyclomatic complexity metric; software maintenance productivity; linearly independent circuits; program control graph; data set; complexity density ratio; software maintenance; software metrics

G. Gill and C. Kemerer, "Cyclomatic Complexity Density and Software Maintenance Productivity," in IEEE Transactions on Software Engineering, vol. 17, no. , pp. 1284-1288, 1991.
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