This paper proves the connection in theory of leadership styles with the practical part on the example company Poskok d.o.o. The work is devided into several sections. In the introduction there is a definition of the problem concerning the connection and establishing links with the theoretical and the practical part. In this case it would be the classification devided in six styles with leadership in Poskok. So the goal was to prove that the theory can be applied ro real firms. That helped the methods which were investigated by means of literature and were combined in a unit. Also a method used was the interview which significantly facilitated the perception of styles in Poskok. Finally, the original goal was achived. The paper managed to connect practical with the theory. The result was the prevailing style of leadership in the company which would mean that the methods of work and the research met the target. The obtained results were consistent with theoretical descriptions of affiliative and instructional leadership. From that it was concluded how much leadership styles impact the business as many authors throughout history investigated and confirmed.