●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

●The project maintains a current and approved set of requirements over the life of the project by doing the following：
·__(73)__all changes to the requirements
·Maintaining the relationships among the requirements，the project plans，and the work products
·……
（73）A．Monitoring
B．Managing
C．Gathering
D．Reducing

●The receiving activities conduct analyses of the requirements with the requirements provider to ensure that a compatible，shared understanding is reached on the meaning of the requirements.The result of this analysis and dialog is an __(74)__ set of requirements.
（74）A．agreed-to
B．agree-to
C．agree-to-do
D．agree-with

●During the project，requirements change for a variety of reasons.As needs change and as work proceeds，additional requirements are derived and changes may have to be made to the existing requirements.It is essential to manage these additions and changes efficiently and effectively.To effectively analyze the impact of the changes，it is necessary that the source of each requirement is known and the rationale for any change is documented.The project manager may，however，want to track appropriate measures of requirements volatility to judge whether new or revised __(75)__ are necessary.
（75）A．proceedings
B．controls
C．forecasting’s
D．prelibations