Iteration planning of product concurrent design process based on activity item

To manage product concurrent design process effectively, a product concurrent design process model supporting the concurrent iteration of product design and process plan is established based on the Generalized Stochastic Petri Nets, the workflow abstract model of the product concurrent design process is given. The task item and activity item of the product concurrent design process is described based on the task decomposition model. The activity item state together with its transformation and the activity item action together with its transformation are analyzed based on the workflow abstract model. The workflow control mechanism of product concurrent design process is built based on the Petri net and activity item. It´s the basis of implementation of concurrent design.