Thanks Mauricio,
I want some thing similar to following example...
Change request (CR) service: it includes from CR assignment to developer, reviwier, and closing the task.
Initially CR will assigned to a developer or group of developers. In this case CR will be in assign state.
Once developers are done with their changes, its status can be marked to complete, and notification will be sent to Reviewer [who could be Sr. Developer]. Once Reviewer is done with his review, the either status can be changed to assiged or approved. Once the status is approved, CR status can be closed based on other testing performed like integration testing. Exceptions can also be implement: like when developer is not able to complete CR within a specified period of time or he went on leave, CR can be re-assgined to other developers [task delegation].
I expect the assignements, changing status will be part of jBPM5 tool set.