The book contains articles in metaphysics and philosophy of language written between 1975 and 1992. Dummett defends the verificationist theory of meaning, according to which in order to know the meaning of a statement one must be in possession of a procedure to verify it. He also argues for the link between bivalence and the metaphysical doctrine of realism. Other topics discussed include refutation of instrumentalism, mathematical applicability, backward causation, and the analysis of the concept of existence.