a google group about Workflow Patterns
From the Workflow Patterns website :
In process-aware information systems various perspectives can be distinguished. The control-flow perspective captures aspects related to control-flow dependencies between various tasks (e.g. parallelism, choice, synchronization etc). Originally twenty patterns were proposed for this perspective, but in the latest iteration this has grown to over forty patterns. The data perspective deals with the passing of information , scoping of variables, etc, while the resource perspective deals with resource to task allocation, delegation, etc. Finally the patterns for the exception handling perspective deal with the various causes of exceptions and the various actions that need to be taken as a result of exceptions occurring.
I have to admit I focus a lot on the control-flow perspective while implementing OpenWFE / OpenWFEru (ruote). I tend to leave the data and resource perspectives to the integrators (Ruby makes my life easier with that).
The google group : http://groups.google.com/group/workflow-patterns
The Workflow Patterns website : http://workflowpatterns.com