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system
subject			fact

system	can have specification which is then implemented by a collection of components
	has definition A logical entity, having a set of definable responsibilities or objectives, and consisting of hardware, software or both
	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
	is divided up into subsystems
	is a kind of subject

Kinds of system :

• distributed system (1 kind, 5 facts) - A system in which computations are performed by separate programs that co-operate to perform the task of the system as a whole
• object oriented system (4 facts)
• prototype (1 kind, 12 facts) (pilot system) - A version of a system created primarily to learn more about the requirements, and not intended to be the final product
• safety critical system (5 facts)
• software system (7 kinds, 10 facts)
• subsystem (4 facts) - A system that is part of a larger system, and which has a definite interface