摘要: The complexity and number of CAD tools is increasing day by day. As a consequence the designer faced with problem selecting appropriate sequence operations keeping in mind current status design. This paper describes flexible supervisor, called Monitor, based on an extended Petri Net model, that handles interactions among user definable set tools. designer, using this interface to system, has at his fingertips updated situation each subpart project he developing. A high degree priority been given friendliness naturality supervisor: can really start it without any training manuals seem be superflous.