The document discusses three main functions of speaking: talk as interaction, talk as transaction, and talk as performance. It outlines the key features and skills involved in each type of speaking. For talk as interaction, the focus is social and involves skills like small talk and turn-taking. Talk as transaction has an information focus and skills like explaining and confirming. Talk as performance transmits information to an audience and involves skills like sequencing information and engaging an audience. The document suggests teachers identify which speaking skills to focus on and design activities matched to developing each type of speaking function.