 We may thus agree with Searle that some locutionary acts are also illocutionary acts, without losing sight of our earlier observation that locutionary meaning underdetermines illocutionary force. This fact about underdetermination is implied by Davidson’s Thesis of the Autonomy of Linguistic Meaning, according to which once a bit of language has acquired a conventional meaning, it can be used for any of a variety of extra-linguistic purposes (Davidson, 1979). Green 1997 argues for a qualification of Davidson’s Autonomy Thesis to recognize sentences having the feature that if they are used in a speech act all, then there is at least one other illocutionary force that their utterance must have. Even in light of this qualified version of the Autonomy Thesis, the most that can be said of, ‘I promise to climb the Eiffel Tower,’ is that it is designed to be used to make promises, just as common nouns are designed to be used to refer to things and predicates are designed to characterize things referred to. Below (Section 6.3) we shall consider the view that force is a component of meaning, albeit not of a sentence’s meaning.[5]