For software engineering metrics, what are some guidelines on the maximum permissible linearly-independent cyclomatic complexity? For a properly designed module, what is the upper-bound on cyclomatic complexity?
The recommendation in the documentation of the tool NDepend concerning method Cyclomatic Complexity is:
Methods where CC is higher than 15 are hard to understand and maintain.
Methods where CC is higher than 30 are extremely complex and should be split into smaller methods (except if they are automatically generated by a tool).
For a properly designed module, what is the upper-bound on cyclomatic complexity?
CC applies well on methods because a method is a unit of code flow understanding. There are other metrics to estimate the classes and modules (as a grape of classes) design and complexity like for example:
Disclaimer: I work for NDepend