This article discusses controlling as an effective management instrument in a selected group of companies, specifically in mechanical and electrical engineering. Controlling is a forward-looking management system focused on discovering bottlenecks in a business, and on achieving business goals. Controlling fulfills tasks in strategic and operational management. In the strategic field, it focuses on the discovery of market opportunities and risks. In the operational field, it focuses on profit management, and assurance of financial stability and prosperity of the business.