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subsystem
subject			fact

subsystem	can be divided up into one or more packages
	has definition A system that is part of a larger system, and which has a definite interface
	is a subtopic of 9.1 - The Process of Design
	is a kind of system
system	can have specification which is then implemented by a collection of components
	exists even if its components change over the course of time, or are replaced by equivalent components
	has scope
	has part component
	has part hardware
	has part module
	has part software
	has part subsystem
	is complex if its scope is broad
	is in a state until an event occurs that causes it to change state