This rule checks for the nesting depth of methods.

Methods which are too deeply nested are usually an indication that one, or several, of the below problems apply:

• the method tries to do too many things;
• objects used by this method lack isolation;
• the code in the method fails to account for early exit conditions.

The first of those conditions above is the most frequent one; the suggested fix is therefore to split the logic of this particular method into several methods.