A method and system for automatically assembling a complete machine readable description of a process by observing and filtering digital messages executing on one or more message bus and that relate to the process. Message details are stored and a tracker record published in a common format. The stored message details are processed into a set of service execution path descriptions, which in turn are processed into the complete machine readable description of the process, using a suitable process design language. The invention automates the capture and documentation of a process, regardless of the complexities of the underlying messaging environment, and produces a complete and unambiguous description of the end-to-end process, free of errors, omissions and interpretation, thereby addressing a key need in any process re-engineering project, including the delivery of SOA implementations and other forms of agile and adaptable systems.