Hi,
I just updated the evaluation example to include some more data passing between the process instance and the task forms:
https://github.com/krisv/jbpm/commit/529b5f6328a699892c14a900da9332158db4588e
The process now includes an additional variable "reason" and this is passed to the Performance Evaluation tasks as well. The performance filled in by the employee is also written as a process variable and then passed to the next persons doing the evaluation as well. The task forms have been updated to show the previously filled in performance when available.
Let me know if it helps. I'lll also try to update the documentation a little more.
Kris