This was a training activity for pre-service teachers in the framework of a seminar called “Lernen und Lehren im außerschulischen Lernort Schullandheim“ (Learning and teaching at an extracurricular place“. After some days with other specific practices with content all around inquiry-based learning and environmental education, the pre-service teachers visited the waste incineration plant in Schwandorf. There they had the chance getting introduced to the Best Practice „Waste“. The teachers were requested to test the Best Practice incl. a guided tour like the students get and evaluate some criteria related to the quality of the Best Practice.