Discussion
What do design-level metrics such as Fan-in and Fan-out primarily measure ?
Answer: B
Fan-in and fan-out measure module interaction complexity.
In a structure chart, a module's fan-in is the number of modules that call it, and its fan-out is the number of modules it calls. Together they describe how the modules depend on one another. High fan-in usually means good reuse; high fan-out means a module coordinates many others and is complex. The Henry-Kafura information-flow metric builds on both.
Code readability is judged from the code itself, not from call structure. Reliability concerns failures in operation. Testing effort can be influenced by these counts, but it is not what they measure directly.
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