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abstraction
subject			fact

abstraction	has definition A representation that captures only essential aspects of something, reducing the complexity apparent to the abstraction's user
	hides details which can be shown at a later stage of design by the compiler or run-time system by the use of default values
	is a subtopic of 2.1 - What is Object Orientation?
	is a subtopic of 9.2 - Principles Leading to Good Design
	is a kind of representation

Kinds of abstraction :

• collaboration (3 facts)
• data abstraction (8 kinds, 5 facts)
• pipe (3 facts) - A connection between two filters in a pipe-and-filter architecture. It joins the output of one filter to the input to another
• procedural abstraction (3 kinds, 4 facts)