Lilli Ahrendt, is a doctor of sport science and a certified physical education teacher. Since her youth she has been working in water with various groups and since 1994 she has been teaching at the German Sport University in Cologne, also dealing with her special subject "Baby swimming". Apart from her scientific investigations and congress lectures she plans and manages the teacher-training and further education courses in parent-child and pre-natal swimming. Quality Management in parent-child swimming.