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Though researches on the BPM are diversifying from interoperability and compatibility problems to various new areas, and even BPM systems are widely accepted in the enterprise IT environment, there still lacks some important issues of verifying business processes. In order to run business process successfully, it is important to verify and debug its process model before deploying to BPM system. In the previous research, a process debugging model which is called request-reply debug model is suggested as a simple and easy to implement framework. Though it was somewhat successful while debugging business processes, it could not handle some exceptional situations like failures of either client or server. In this paper, we incorporate some fault tolerance features in the request-reply debug model, and advanced its architectural design to robustly handle debugging sessions. With this enriched debug model and architecture, it is expected that the debugging of business process can be done in a more robust way.