Activities may be of two different types: task and sub-process. Task is an
atomic activity, that is, the work not broken down to a finer level of process model
detail; sub-process is an activity made up of several subactivities.
The third type of Flow Object is the gateway used to control the divergence and
convergence of multiple sequence flow. Gateway represented with a diamond has,
as events, different icons to represents different possible flow control behavior.
Flow objects may be connected to each other or may be connected to Artifact by
three different types of connecting objects: sequence flow is used to connect a Flow
Object with the next Flow Object that will be performed in the process. The second
Connecting Object is the message flow used to show the flow of messages between
two participants (participants are represented by Swimlanes); finally associations
are used to connect information (Artifact) with Flow Object.
Swimlanes are used to group Flow Object, Connecting Object, and Artifact. Swimlanes
are made up of Pools that represents a participant in a process.
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