Purpose: Purpose of the study is to clarify the theoretical model of organizational structure evolution, which is based on the hypothesis that two types of organizational structures sequential and parallel, dialectically replace each other. It is assumed that the growth of organizations in the transition between two different types of organizational structures has a different nature - intensive or extensive. Design/methodology/approach: Retail sector enterprises, whose organizational structure is largely determined by separate divisions, are selected. The cluster analysis is chosen as a research method to split the initial data set into groups. In order to clarify the results of the cluster analysis, the principal component method is used. For the study, 2,249 retail organizations of the Czech Republic were initially selected. Findings: The analysis put us to make the following clarifications in the model: a) in the transition from a parallel organizational structure to a sequential one the growth of an organization is of an intensive nature, and in the transition from a sequential organizational structure, growth is extensive; b) development patterns are determined by three key factors: the size of an organization, the effectiveness of its activities and the age of an organization. Research/practical implications: The results of the research generally confirmed the hypotheses put forward and showed coincidence with the proposed theoretical model of the evolution of the organizational structure. Originality/value: The use of the proposed model allows owners and managers to more rationally undertake the development of commercial organizations in the long term.