In this research, we have deveoped modelling on various process phases and prototyping environments.・At first, we introduced a structured framework of collaboration by concurrent objects. On the assumption that behaviors of concurrent objects can be represented by path expressions based on regular expressions, we defined primitive collaborations among objects and expressed any collabolation on them structurally.・Next, we proposed a design policy that we should structurally make clear the functions to be implemented through collaborations and then implement the primitive collaborations by co...