One Model

One Model, Many Interests, Many Views

Mapping for the Activity Diagram

Control classically flows from left to right (when drawn horizontally) or top down (when drawn vertically). Rounded rectangles on branches represent activities or functions. Where an activity has a decomposition specifying greater detail, a “pitchfork” in the corner of the node indicates the decomposition is present. As noted in the “Representing Behavior – Control Constructs” section, diamonds (decision nodes) and bars (fork and join nodes) represent control constructs upon which behavior is built. As each activity is completed, control flows along the branch lines to the next activity or control construct. Every construct has a precise definition that prescribes how control will be passed within the construct and when the construct itself will end. This structure results in a complete specification of control flow which itself is fully executable.

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