Abstract: Someone may express a claim within a system of presuppositions held by his hearers. The presuppositions are however not part of the claim, and the truth-value of the claim does not depend on the truth-value of the presuppositions. The presuppositions of a culture also act to limit the range over which type sentences have clear meanings. A statement being true is a matter of its truth — conditions being satisfied to the degree of accuracy appropriate in the context.

Keywords: accuracy, claim, truth-value, type sentence,