Go and see
Within their control
Done daily (ideally) or at least weekly
Meaningful to the team (they want to improve it)
Beneficial to the company (will have business impact)
What can we fix?
What must we fix to get to the target?
Swimlane or process map
Output metrics for safety, quailty, cost, morale and environment
Daily is best
Stand up at team board
Data and metrics are visible and up-to-date
More than 20 minutes
Here's an interesting quiz for you.