Abstract: A method for controlling an elevator group in which statistical data on a traffic flow within an elevator group, representing the times, local and total volumes of the traffic, and a number of different traffic types used in a group control are stored in a memory unit belonging to the control system. The traffic flow is divided into two or more traffic components, the relative proportion or different traffic components and the prevailing traffic intensity are deduced from the traffic statistics, the traffic components and traffic intensity, i.e. the traffic factors, are subjected to assumptions whose validity is described by means of membership functions of the factors. A set of rules which correspond to different traffic types are formed from these factors and are assigned values by means of the factors and membership functions, the rule which best describes the prevailing traffic is selected, and the traffic type corresponding to the selected rule is used in the control of the elevator group.