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coupling
subject			fact

coupling	has definition A measure of the extent to which interdependencies exist between software modules
	implies that if you want to reuse one component, you will also have to import all the ones with which it is coupled
	is a subtopic of 9.2 - Principles Leading to Good Design
	is a kind of measurement
	is a kind of software quality
software quality	is hard to assess

Kinds of coupling :

• common coupling (6 facts) - A form of coupling in which components share data using a global variable and thus become dependent on each other
• content coupling (1 kind, 4 facts) - An undesirable form of coupling in which a component surreptitiously modifies internal data of another component
• control coupling (7 facts) - A form of coupling in which one component affects the sequence of execution in another
• data coupling (6 facts) - A form of coupling in which one component passes simple data to another as an argument
• external coupling (4 facts) - A form of coupling in which a software component has a dependency to software written by a third party, or to a particular type of hardware
• import coupling (8 facts) - A form of coupling in which one component declares that it imports (makes use of the definitions in) another
• inclusion coupling (7 facts) - A form of coupling in which one component includes the source code of another component. All the includers of a component are coupled to each other and to the included file
• low coupling (3 facts) - A kind of coupling in which the interconnections among parts of a system are reduced, making makes the resulting application easier to understand, modify and test
• routine call coupling (5 facts) - A form of coupling in which one routine calls another
• stamp coupling (5 facts) - A form of coupling in which two components modify or access data in the same object
• tight coupling (3 facts)
• type use coupling (10 facts) - A form of coupling in which several components make use of the same globally-defined data type