Learning by teaching
In professional education, learning by teaching (German: Lernen durch Lehren, short LdL) designates currently the method by Jean-Pol Martin that allows pupils and students to prepare and to teach lessons, or parts of lessons. Learning by teaching should not be confused with presentations or lectures by students, as students not only convey a certain content, but also choose their own methods and didactic approaches in teaching classmates that subject. Neither should it be confused with tutoring, because the teacher has intensive control of, and gives support for, the learning process in learning by teaching as against other methods.
History
Seneca the Younger told in his letters to Lucilius that we are learning if we teach (epistulae morales I, 7, 8): docendo discimus (lat.: "by teaching we are learning"). At all times in the history of schooling there have been phases where students were mobilized to teach their peers. Frequently, this was to reduce the number of teachers needed, so one teacher could instruct 200 students. However, since the end of the 19th century, a number of didactic-pedagogic reasons for student teaching have been put forward.