Are you sure that you put the right measures to influence the actual root cause of a problem? Do proper analysis before going into action so you get better results faster.
When we work with Lean, it is important that we create an environment where we dare and want to test new ways of working. We should not say NO we’ve tried. Since we strive to make many small improvements all the time it’s usually easy to reverse if there wasn’t an improvement but only a change.