reporting tied to KPIs - a fun exercise

Summary

If you could identify champion users (of Financials Cloud) what would you track?

Content

By champions, I mean users who are successfully using the tool to help meet your organization's KPIs.  For example:  Let's say one of your KPI's is to reduce processing errors to help close the books faster.  Is there a user stat you can track to identify which users are thriving in this area?  What about other examples?  I'm hoping to get some great feedback.  Again, in summary...what user stats have folks found useful to track that allow you to identify champion users?  And what KPIs have you noticed are being impacted by these findings?  Thanks!