Product development process is first analyzed and classified into five categories. Then, a universal dynamic extensible workflow model for cooperated work is proposed for realizing automatic process management. The related data structure and functional components are described in detail. Finally, an example for machinery design is illustrated.%对工程开发过程的运行方式进行了分类，提出了一个通用的、具有较强扩充能力的动态协调工作流模型，并阐述了实现这种模型的数据结构和功能构件，以适用于工程开发过程的自动化管理. 最后，针对机械设计领域，利用在PC机上开发的工作流工具，给出了一个具体的实例.
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