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system domain model (domain model)
subject			fact

system domain model	is a synonym of domain model
	contains domain classes, associations and attributes
	contains elements that represent things in the domain
	does not contain elements that do not represent things in the domain, but are needed to build a complete system
	is a subtopic of 5.8 - The Process Of Developing Class Diagrams
	is developed during requirements analysis, or the early stages of design
	is a kind of model
	omits many classes that are needed to build a complete system; in fact it can contain less than half the classes of the system
	only models things that will actually be implemented
model	becomes the core of documentation describing the system
	is crucial in software development
	is used to describe a software system
	is used to validate a software system
	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

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