Transaction management is the key component of process-sensitive engineering environments(PSEE). In recent years, several advanced transaction models have been proposed to support long transaction.However, in view of specific characteristic in software process transaction, those models only meet its partialrequirements. Moreover, no commercial or academic results of nested cooperative transaction models have reacheda status stable enough for commercial implementation. It remains a real challenge to the transaction mechanism ofPSEE. In this paper, a criteria-based transaction model E-Process/TM is presented, that may address the keyfeatures of software process, i.e. interactive user control, long-duration activities, iterative approach and multi-usercooperation on shared persistent data. Based on user defined correctness criteria, E-Process/TM offers inherentbenefits in flexibility and openness. By now, this model has been implemented in a commercial PSEE product, andapplied in practice successfully.