Before revision: The „Berliner Modell“ (also known as “ lehr-lern-theoretische Didaktik ” ) was developed by Paul Heimann (1901–1967) in .
After revision: The Berlin Model (Berliner Modell) (also known as “ lehr-lern-theoretische Didaktik ) was developed by Paul Heimann (1901–1967) Teaching-learning theory of edcuation" ( .