[Measurements of the knowledge about change]

In recent studies the variable knowledge about a changing world has shown up as a relevant determinant of cognitive development in old age. In this paper the measurement criteria of the inventory are established, and an evaluation of the reliability and validity of the inventory is achieved. At the same time we present evidence that the knowledge about the more constant aspects of the world and the knowledge about the changing aspects of the world develop differently. Epochal influences on the validity of the inventory are discussed.