Controlling is a contemporary business function and an expert support in management, in order to adapt to changes in a faster and more qualitative way. Controlling is proactive and it plays a major role in rational managing while using adequate instruments. The most used instruments of controlling are the cost calculation and its optimization providing an insight into the success and economy of the business. The next important instrument of controlling are indicators and systems of the indicators which are used in order to determine what business goals are, in addition to that, they also observe any possible deviation. Production is one of the most essential business functions in the company and the key for the optimal productivity is in data availability. The task of controlling is processing and analyzing data as well as providing concrete information, that are essential when making important business decision. According to the size of a company and taking its needs into consideration, the process of institutionalization of controlling’s function is done through the project of implementation. The exceptional importance in realizing a certain project and making it successful is the support of the management. Synergy of business partnership among management and controlling, team work and acting accordingly to the Professional Code of Ethics are the key elements in achieving competitive advantage and business efficiency.