This book shows step by step how to develop, implement (engineering) and operate (administration) technical systems efficiently and effectively. To this end, it first explains how complex real systems are simplified, i.e. modeled, in order to make their relevant properties visible. This is done in an interdisciplinary manner by taking into account not only technological but also sociological and psychological aspects. Five generally valid process models are then explained, which are sufficient to design and control systems in all their life phases. Finally, the problem-solving cycle is...