In other words, he doesn’t know about the effects of his actions of production control on production in advance. In many cases he has to trust his gut feeling about what action in what area he should perform to successfully equalize disturbances in production. It might work in most situations quite good, if he has a long history at the exemplary company, is well experienced in the field of production management and knows the production processes very well. But if he is comparatively new in a company and can’t rely on his gut feeling, a missing proper decision support can be a huge problem.