Performance can only be measured when performance related data is available in the Maintenance System.
Master Data
When you like to measure the performance for Individual Maintenance Engineers, Teams, Departments, etc, you need to have this data as master data available in your Maintenance System. So your organization structure needs to be somewhere in the Maintenance System. Same counts when you would like to measure performance for Support, Customers and Product (versions), service or feature packs, packages, modules, etc, as well.