The Austrian National Tourist Office is installing a Marketing Information System (MIS). The aim of this MIS is to ameliorate the information flow of the everyday work and to develop a budget allocation model. The construction of the allocation model consists of 3 steps: 1. Explanatory model of the tourism flows; - 2. Forecasting model; 3. Final budget allocation model. In this paper we would like to introduce our first works on the explanatory model.