Embodiments described herein relate to an improved system and method for defining and reconfiguring process flows for one or more processes within an organization visually in a graphical display at a client system using a process flow diagram comprising activity elements and decision elements representing the activities and decisions to be performed during execution of a process flow. Modifications to the process flow diagram at the client display can be saved and used to update the process flow. The process flow definitions and/or reconfigurations can be supplied to a server for storage in a database, and can be later accessed during execution of the process flow. During execution of the sequence of activities of a particular process flow, the server can access one or more services from a plurality of different service modules in communication with the server to provide those services.