The role of competencies is discussed with respect to science teaching. In particular, competence models from Germany, Switzerland and Austria are presented and compared. A special topical program, "Competencies in Mathematics and Science Teaching", was started in Austria three years ago. Initial experiences with this program are reported, specifically with regard to how the teachers adopt this new idea of competencies and which kind of support is appreciated. Two aspects of the program are explained in detail: the evaluation of the program and the role of exercises and problems.