Advocates of the "Let's talk' proposal emphasize the importance of access to both comprehensible input and conversational interactions with teachers and other students. They argue that when learners are given the opportunity to engage in interaction, they are compelled to negotiate for meaning, that is to express and clarify their intentions, thoughts, opinions, etc., in a way that permits them to arrive at mutual understanding. This is especially true when the learners are working together to accomplish a particular goal, for example in task-based language teaching (TBLI). According to the interaction hypothesis, negotiation leads learners to acquire the language forms-the words and the grammatical structures that carry the meaning they are attending to. This is the theoretical view underlying the teacher student behaviour in the transcript from Classroom Band from the student-student interaction in Communication task A in Chapter 5