O1 The development among 640 students of the scientific skills in chemical analysis, being capable to identify currently present anions and cations in water. O2. The development among 640 students of the scientific skills related to biology, being capable to identify different tree and bush species from the European continent. O3. Acquainting 720 students with basic skills in photography, with an emphasis on the exposure and the application of the general rules of photographic composition.