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informal class diagram
subject			fact

informal class diagram	does not model software that will be developed
	helps in understanding the domain
	is a subtopic of 5.8 - The Process Of Developing Class Diagrams
	is part of exploratory domain model
	is a kind of class diagram
	may be created while performing domain analysis
	usually contains classes, associations and attributes that are outside the scope of the system
class diagram	can generate an infinite number of instance diagrams
	describes the data found in a software system
	has part OCL statement in a class diagram
	is an important tool for requirements analysis and design of object oriented software systems
	may show attributes and operations contained in each class by dividing a class box into three smaller boxes: the top box contains the class name, the middle box lists the attributes, and the bottom box lists operations.
	may show that a class has no attributes or operations by showing an empty box
	shows the services offered by components and the main data to be stored
UML diagram	see also Unified Modelling Language
diagram	has advantages it conveys or summarizes complex concepts or mechanisms more easily than other techniques
	has problems can be hard for users to interact with or interpret not usable by blind people it can be expensive to program diagram drawing software
	should have a label if its meaning is not obvious, using a caption or pop-up label that appears when the user moves the mouse over it

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