In the Lecture Hall Redesign Project at Vienna University of Technology (V.U.T.) highlighted by Bob Martens in his paper, planners and students were assisted by environmental psychology. The V.U.T. was the first Austrian university offering environmental psychology courses since 1991, followed by the Graz University of Technology. Other than in public schools, studies on university lecture halls have been sparse and unsystematic. Nevertheless, redesign studies of university environments belong to the classical fields of environmental design studies (e.g. Sommer's soft classroom). To generate useful input prior to the intended process, a qualitative, narrative questionnaire form followed by a semantic differential designed for university lecture halls, was used. The main object under study was the V.U.T. old lecture hall 7, called Schuette-Lihotzky-Auditorium, a 220 seat object with historic dignity but in a bad state with a high need of repair. Parallel studies were done in the recently renovated hall 18 (247 seats), hall l4a renovated longer ago (106 seats), and hall 6 (177 seats). Necessary upgrading of lecture hall 7 had in mind an aesthetic and user-friendly design. Besides user wellness, what are the functional focal points of a lecture hall fit for the next millenium? The practical study secured answers from experts (planners and university teachers) and student users (experts for lecture hall use !) and produced input for the design program. As the lecture hall users collected the empirical input and did the design work, the Lecture Hall Redesign Project is an ideal didactic prototype of a user participation process steered by architecture and environmental psychology.