Smallest particles everywhere? Why does ice float? Why can't you see the fat in milk? This experiment has always been an undisputed part of good science education. However, it should not just be about following experiment instructions. Only through independent planning, conducting, and evaluating experiments can your students explore the sciences in a research-oriented way and develop a lasting interest in chemistry. This volume provides a solid theoretical framework along with numerous practical suggestions for designing learning processes aimed at acquiring the skills for open experimentation. With its well-developed lesson plans for opening up individual phases of the experimentation process, the practical section offers you a comprehensive foundation for your own chemistry teaching.