For the planning of infrastructure systems, the models that include key elements of accessibility to municipal services in the early stages of spatial planning can be developed. Models for decision-making in spatial planning should enable suitable spatial presentation, economic assessments, and timely planning of infrastructure systems. This article describes the model of the accessibility to municipal services, which is based on the use of methods of fuzzy logic. Spatial, economic, and temporal variables of the fuzzy model are discussed, and a method for the determination of the membership functions is proposed. This method is based on sampling infrastructure systems within different classes of population density. A statistical analysis of 156 existing residential areas in the Republic of Slovenia has covered from 10 to 20% of the residential areas within 10 local communities. Validation of economic variables and verification of proposed spatial membership functions has been made within 16 residential areas of diff erent settlement densities and level of urbanization. The proposed method of spatial analysis is suitable for determining membership functions. For the proposed variables, a model of accessibility to infrastructure systems within Slovenia can be developed. There is a need for further research to establish a comprehensive model related to the infrastructural capacity, as well as environmental and social aspects of accessibility to municipal services.

Key words: spatial planning, fuzzy modelling, accessibility, municipal services