Communication diagrams show how different objects interact to carry out a task. Most of the information that appear on a communication diagram would also appear on a sequence diagram. Each object is placed within a rectangle and the rectangles are connected by arrows which indicate in which direction the information is flowing. The arrows are labelled with details of what the information is that is being shared. Arrows are also numbered to show in which orders the interactions take place.
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Task1: Create a communication diagram for an auction website. (e.g. eBay)
Task 2: Create a communication diagram for a social network. (e.g. Facebook)
Task 3: Create a communication diagram for a game of Pacman.