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interaction diagram
subject			fact

interaction diagram	can be used to define the protocol used when two components communicate with each other
	can contain more or less detail depending on what you wish to communicate
	can show several different types of communication including: messages exchanged over a network simple procedure calls commands issued by an actor through the user interface
	has definition A sequence diagram or collaboration diagram used to model the dynamic aspects of a software system
	has part actor symbol
	has part message symbol
	has part object symbol
	has purpose to better understand the sequence of messages
	helps you to visualize how the system runs
	is a subtopic of 5.1 - What is UML?
	is a kind of UML diagram
	models the dynamic aspects of a software system
	should be created after developing a class diagram and a use case model because you need to know the actors and objects involved in an interaction
	shows the behaviour of systems in terms of how objects interact with each other
UML diagram	describes aspects of the architectural model
	has part constraint
	has part note
	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

Kinds of interaction diagram :

• collaboration diagram (1 kind, 11 facts) - A UML interaction diagram showing a set of objects connected by communications links
• sequence diagram (1 kind, 13 facts) - A UML interaction diagram showing the sequence of messages exchanged by the set of objects and optionally an actor. Actors and objects are on one axis, and time is on the other

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