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diagram
subject			fact

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
	is a subtopic of 7.4 - The Basics of User Interface Design
	is a kind of coding technique
	is a kind of representation
	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

Kinds of diagram :

• earned value chart (7 facts) - A diagram used in project tracking, that allows you to compute the amount by which you are behind schedule and over budget; it shows elapsed time on one axis, and effort expended on the other axis
• Entity-Relationship diagram (1 kind, 6 facts) (ERD)
• flow graph (3 facts) - A graph showing all possible paths through an algorithm
• Gantt chart (7 facts) - A diagram used to graphically present the start and end dates of each software engineering task; it shows time on one axis, and tasks on the other
• PERT chart (11 facts) - A diagram showing the sequence in which tasks must be completed
• UML diagram (10 kinds, 7 facts)