Because of the identified demand for risk management conceptions, a risk management model is developed in this doctoral thesis. The starting point of the derivation is the finding, that risks have to be handled on base of a structured decision process (risk management process). This means the risk management process is an essential part of risk management, although risk management must not be reduced to this single dimension, because a holistic view of risk management means, that in addition to the risk management process all relevant aspects of the management function have to be taken into account. In this doctoral thesis the derivation of the risk management model is founded on three guiding ideas, that is the decision based science of industrial management, the St.Galler management conception, and the Leobner generic management conception. Based on these guiding ideas, on the basics of the risk management process, and on the fundamental facts of industrial enterprises, a risk management model is derived and described in detail for the maintenance function. The detailed description of the model for the maintenance function should be the starting point for further research work in the future and the base for the implementation of the model in industrial enterprises.