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model
subject			fact

model	becomes the core of documentation describing the system
	has definition An abstract representation of a system, that conveys a certain aspect of it in an understandable and analyzable way
	is crucial in software development
	is a subtopic of 5.1 - What is UML?
	is used to describe a software system
	is used to validate a software system
	is a kind of representation
	see also model^2
	should be understandable by clients and users so they can participate in the development process as much as possible
	should be properly reviewed
	should provide abstraction so that not all details are visible at once
	should provide insights about the system when software engineers analyze it
	should use a standard notation such as UML so that everybody who looks at it will interpret it the same way
	will contain classes from the original system if the system is an extension to an existing system
	will contain many classes from the framework if the system is being built using a framework

Kinds of model :

• exploratory domain model (8 facts)
• signature (3 facts) - The format of an operation or message, including arguments and return value
• system domain model (9 facts) (domain model)
• system model (6 facts)
• use case model (5 facts)