The （71） is a general description of the architecture of a workflow management system us
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The （71） is a general description of the architecture of a workflow management system used by the WFMC, in which the main components and the associated interfaces are summarized. The workflow enactment service is the heart of a workflow system which consists of several （72）.
（71）
A. waterfall model
B. workflow reference model
C. evolutionary model
D. spiral model
（72）
A. workflow engines
B. processes
C. workflow threads
D. tasks
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