The article explores how what a speaker says and means can be influenced by the words used, intentions, and conversation context. It discusses illocutionary force, speaker meaning, and semantic content, as well as conversational projects, norms, and common ground. The study also looks at the context-sensitivity of certain expressions and how it affects communication. The researchers use these tools to explain quantity implicature, presupposition accommodation, domains of discourse, and illocutionary silencing.