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Workflow Perspectives
"Workflow specifications can be understood, in a broad sense, from a number of different perspectives .
- The control-flow perspective (or process) perspective describes tasks and their execution ordering through different constructors, which permit flow of execution control, e.g., sequence, choice, parallelism and join synchronization. Tasks in elementary form are atomic units of work, and in compound form modularise an execution order of a set of tasks.
- The data perspective deals with business and processing data. This perspective is layered on top of the control perspective. Business documents and other objects which flow between activities, and local variables of the workflow, qualify in effect pre- and post-conditions of task execution.
- The resource perspective provides an organizational structure anchor to the workflow in the form of human and device roles responsible for executing tasks.
- The operational perspective describes the elementary actions executed by tasks, where the actions map into underlying applications. Typically, (references to) business and workflow data are passed into and out of applications through activity-to-application interfaces, allowing manipulation of the data within applications. "
(YAWL - Yet Another Workflow Language)
BPEL
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