Analizo::Metric::CouplingBetweenObjects - Coupling Between Objects (CBO) metric
The metric calculation is based on the following article and calculates the number of calls to other modules.
Article: A metrics suite for object oriented design by Shyam R. Chidamber and Chris F. Kemerer.
See the paragraph about Coupling Between Objects in the article:
Theoretica Basis: CBO relates to the notion that an object is coupled to another object if one of them acts on the other, i.e., methods of one use method or instance variables of another. As stated earlier, since objects of the same class have the same properties, two classes are coupled when methods declared in on class use methods or instance variables defined by the other class.