In the scientific theory of sport science four major questions can be considered: (1) What is the function of science? (2) What is the body of knowledge of a scientific field? (3) What is the appropriate research methodology? (4) How are research results applied to the practical field? This publication structures the body of knowledge of German sportscience and focuses on the second question. Answers to the other questions are given implicitly within the articles relating to the specific subdisciplines of sport science.