Provided is a system for the maintenance of a plant with at least one input unit for inputting semantically annotated observations of a user with respect to at least one system component of the plant; and a data processing unit for determining maintenance procedures for the maintenance of the plant on the basis of a semantic plant data model of the plant and on the basis of relationship data models, which indicate relationships between plant component states and observations, as a function of the semantically annotated observations inputted by means of the input unit.
