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operating system
subject			fact

operating system	contains a kernel layer and higher level layers dealing with such functions as user account management, screen display, etc.
	is a subtopic of 9.5 - Architectural Patterns
	is a kind of multi-layer system
multi-layer system	has part layer
	uses multi-layer architectural pattern
software system	becomes complex because it is easy to add new features and because software engineers typically add features without fully understanding a system, which may not have been originally designed to accommodate the features
	can automate business process
	can be divided in many ways: A distributed system is divided up into clients and servers A system is divided up into subsystems A class is divided up into methods
	is better at error handling if it effectively prevents the user from making errors, detects errors, and helps the user to correct errors
	is typically initially developed as a prototype
	must have well-described requirements if other systems or subsystems are going to use its services or communicate with it
	should be designed for flexibility right from the start
	undergoes evolution over its life-span
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
	is divided up into subsystems

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