Business process defining and structuring influences the evolution of organizations’ business activities. It represents the starting point on the path to establishing of an process mature organization. A number of elements is needed to be met to get the organization out of a state of complete unstructuredness. Micro, small and medium enterprises are interesting for considering the adoption of the concept of business process management (BPM), not only because of their size but also because of managerial role of the owner, the way of managing and decision making, as well as assigning multiple roles and responsibilities to one employee. This paper analyzes the defining and structuring of BPM within groups of micro, small and medium sized enterprise. The TOPSIS method was applied for the purpose of ranking enterprise groups in accordance with the establishment of defining and structuring elements.