Training students for systematic approach in solving the given problems, conducting analysis, applying acquired knowledge and accepting knowledge from other fields in order to find a creative solution to the given problem. By studying independently and solving tasks in the field of the subject, students acquire new scientific knowledge about the complexity of the problems in the field of their thesis. By developing a doctoral dissertation, students gain certain experiences that they can apply in practice when solving problems. By preparing results for public defense, performing public defense, and answering questions and remarks of the commission, the student acquires the necessary experience on the way in which the results of independent or collective work should be reflected in practice.