The idea of management has a universal meaning and universal applicability, which is why it is applicable in all spheres of business in various organizations. Management means working with others and by others with the purpose of achieving company goals in an efficient and effective way in an ever-changing environment. Entrepreneurship is the developmental and driving force of every economy and small and medium-sized enterprises are the generators of employment and the foundation for the development of the world economy. The market – based management puts in front of small and medium-sized enterprises great challenges which they can only solve through effective management which is inherent only to them. Management of Small and Medium Enterprises, in theory, is not different from management in large companies, but in practice, it is performed differently. The particularities of management in small and medium-sized enterprises are best shown in the entrepreneurial effort to take over the role of managers, in the form of ownership of enterprises, in the management of a family enterprise, in the life cycle with reference to changes in the style of management within the cycle, in the connection between the development of small and medium-sized enterprises with regional development and the influence of the corrupting environment on management. Particularities of management in small and medium-sized enterprises which are given are shown through a case study on the example of small enterprise Croatherm Praha Ltd. and its owner. The case study gives a detailed showing of how a small business operates, its management and particularities, which is also the aim of this paper. Company Croatherm Praha Ltd. was selected because I completed my compulsory professional practice in the Czech Republic as a graduate of master's Degree in Erasmus + program.