The challenge is to have indicators that allow us to act.

Incremental improvements take place at the "lean problem solving boards". 

Here, teams discuss performance gaps and improvement opportunities on a weekly basis. 

Performance is measured and compared against goals. Any deviation from target (1) is addressed with rootcause problem finding and/or improvement suggestions (2). As the problem solving progresses (3,4,5), the boards keep track of the number of improvement actions in progress and the number of improvement actions closed (6,7).