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activity diagram
subject			fact

activity diagram	can represent the flow of work that an object or component performs the interaction between different use cases
	has definition A UML diagram showing sequences of activities, typically for multiple threads
	has advantage it can represent concurrent activities
	has part fork
	has part join
	has part rendezvous
	is a subtopic of 5.1 - What is UML?
	is usually associated with several classes
	is a kind of UML diagram
	shows how systems behave internally
	shows the partition of activities among the existing classes using swimlanes
UML diagram	describes aspects of the architectural model
	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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