A method for predicting a persistence over time of entries of a knowledge base variable over time, the knowledge base including triples of entities, property identifiers of properties of the respective entities, and expressions of these respective properties, the prediction being made as a function of an output value of a classifier, and the classifier being trained as a function of triples that are present in the knowledge base at two different points in time separated by a time interval, to output the output value that characterizes for a predefinable triple whether or not the expression stored in the triple is stable over this time interval.