It is instinctively known that changing conditions on the ski course affect competitors` performances. It may be furthermore affirmed that the effect of changing conditions cannot be avoided completely in out-door, natural circumstances. This project is based on 3D kinematical measurements taken on the slalom ski course with an investigation of five world cup level ski racers. It deals with an investigation of the effect of changing conditions on several kinematic parameters such as the centre of gravity`s and arithmetic mean of the skis` velocity, the length of the centre of gravity`s and arithmetic mean of the skis` trajectory, the horizontal as well as vertical point of the beginning and end of the turn and the time needed to complete a turn. The results show a significant effect on several of the inspected parameters that give us a basic idea about the consequences.
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