The Author: Martin Böcker was born in 1959 in Münster/West Germany. He studied psychology at the University of Münster and the Technical University in West-Berlin. The years between 1986 and 1990 he spent at the University of Exeter/England from which he received his doctorate degree in 1991. After working at an EC-RACE-project at a German industrial company, he now works at the Heinrich-Hertz-Institut in Berlin in the area of Human Factors in telecommunications.