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S/W Quality metrics/indexes

1. CC (Cyclomatic Complexity)

Cyclomatic complexity is a software metric used to indicate the complexity of a program. It is a quantitative measure of the number of linearly independent paths through a program’s source code. It was developed by Thomas J. McCabe, Sr. in 1976.

Cyclomatic complexity is computed using the control flow graph of the program: the nodes of the graph correspond to indivisible groups of commands of a program, and a directed edge connects two nodes if the second command might be executed immediately after the first command. Cyclomatic complexity may also be applied to individual functionsmodulesmethods or classes within a program.

One testing strategy, called basis path testing by McCabe who first proposed it, is to test each linearly independent path through the program; in this case, the number of test cases will equal the cyclomatic complexity of the program.[1]

2. DC (Duplicate Code)

3. MCD (Modified Circular Dependency)

It happens when a bean A depends on another bean B, and the bean B depends on the bean A as well:

Bean A → Bean B → Bean A

Of course, we could have more beans implied:

Bean A → Bean B → Bean C → Bean D → Bean E → Bean A

4. CBO (Coupling Between Object)

Coupling between objects (CBO) is a count of the number of classes that are coupled to a particular class i.e. where the methods of one class call the methods or access the variables of the other. These calls need to be counted in both directions so the CBO of class A is the size of the set of classes that class A references and those classes that reference class A. Since this is a set – each class is counted only once even if the reference operates in both directions i.e. if A references B and B references A, B is only counted once.

C&K viewed that CBO should be as low as possible for three reasons –

  1. Increased coupling increases interclass dependancies, making the code less modular and less suitable for reuse. In other words if you wanted to package up the code for reuse you might end up having to include code that was not really fundamental to the core functionality.
  2. More coupling means that the code becomes more difficult to maintain since an alteration to code in one area runs a higher risk of affecting code in another (linked) area.
  3. The more links between classes the more complex the code and the more difficult it will be to test

The only consideration in calculating this metric is whether only the classes written for the project should be considered or whether library classes should be included.

5. LOC (Line of Code)

Source lines of code (SLOC), also known as lines of code (LOC), is a software metric used to measure the size of a computer program by counting the number of lines in the text of the program’s source code. SLOC is typically used to predict the amount of effort that will be required to develop a program, as well as to estimate programming productivity or maintainability once the software is produced.

6. GV (Global Variable)

7. PP (Predefined Preprocessor)

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