The (1) 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 (2). 
(1)A. waterfall model 
B. workflow reference model 
C. evolutionary model 
D. spiral model 
(2)A. workflow engines 
B. processes 
C. workflow threads 
D. tasks
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