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DRAFT, February 18, 2003, Page 7<br />
Complexity Profile Graph (CPG). The CPG is a statement-level complexity metric intended to provide<br />
a measure of source code comprehensibility [Cross et al. 1997, McQuiad et al. 1997]. Figure 7 shows the<br />
CPG for the Java class ArrayTest3 from Figure 1 above. The source code is divided into chunks or<br />
segments roughly corresponding to program statements. Each segment is assigned a complexity that is<br />
a weighted sum of individual metrics for reachability, content, breadth, and inherent complexity, and then<br />
represented as a bar in the graph. The CPG is currently generated for Ada and Java source code. The<br />
premise is that the peaks in the CPG indicate the area that may be most difficult to comprehend and, as a<br />
result, may be the most likely place to find errors in the code. These peak sections should be<br />
reviewed/tested more carefully, or the code should be rewritten to reduce the complexity.<br />
Figure 7. Complexity Profile Graph
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