EN
Adoption of a definite technology of timber harvesting is connected with achievement of management aims and creates health hazard for machine operators. The purpose of this study was to determine a model of analysis of selected ergonomic aspects on the basis of probabilistic modeling. A model description of physical factors of work environment is presented in this paper. It permits to determine the state of danger for operators during timber harvesting processes of different technological and organizational levels. The analyses showed that the presented model of ergonomic analysis, based on approximations of the probability function and probability measure, permits to make the estimate of many criteria of danger for operators.