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An approach to concurrent software development is proposed. The article introduces the implemented principles of an integrated development environment for concurrent software based on object oriented Petri nets (OOPN) with multi-computer coordinate working. Under this method, two programming levels of concurrent software design are adopted. The top level is for concurrent part modeling by drawing object oriented Petri net pictures. The bottom level is for sequential part programming by using traditional high level languages. OOPN-IDE (Object Oriented Petri Net based Integrated Development Environment) is the research result for the methodology (J. Niu, 1999). It can make both the concurrent part of Petri net pictures and the sequential part of high level language programs be integrated as a whole concurrent program autamatically.