You must have the process_report_admin role to access reports. Historical reporting provides aggregated reporting with regard to the performance of one or more business processes and the activities, users or groups associated with them.
To view historical reports:
Do one of the following, depending on the options available:
Click either Process Report or User Report.
Select Tools>Workflow>Historical Report and then either >Process or >User.
In the General tab, select the duration and other parameters for which you want to run the report.
Click Run
In the Results tab, you view the report.
To save the report to run again, click Save.
From the Process Historical Report, you can view the Activity Historical Report by clicking the process.
You can view the Process Details Historical Report by clicking an instance.
From the User Historical Report, you can view details by clicking a user or instance.