Hi Kurniapank ,StepID in that method is the reference for the step the user is currently on. The returncode is the result of that step, which the server will use to automatically figure out what step to go to next.If you look up the method in the help, file:///C:/Program%20Files/WMX/Server10.1/Developer%20Kit/Developer%20Help/Workflow%20Manager%20Server%20REST/index.html there is a high level example.Cheers,Michael