F. claims that speech act theory, as such, cannot account for all aspects of language use, because a stretch of discourse is not just a concatenation of separate speech acts. Therefore he proposes a speech activity theory which does not only make use of the notion 'speech act', but which relies heavily on the notion 'context' (in a very general sense), the distinction between controlling and controlled speech and the concept of 'master speech act'. The controlling parts of discourse are constituted by master speech acts (such as 'Let me tell you what happened to me yesterday') which indicate (or 'control') the type of discourse to be expected.