As time went by, Chisholm became dissatisfied with this picture. One main source of difficulty, as he saw it, was the commitment to times. Furthermore, in spite of their utterly central place in this ontology, he began to feel uneasy about states of affairs. Some of his concern evidently arose as a result of conversations with his colleague Jaegwon Kim, who had developed a different theory of events. On Kim’s theory, if we have a suitable object a, property F, and time t, and a has F at t, then there is an event, a’s having F at t. An event is the having of a property by a thing at a time.