This document discusses interaction in the language classroom and different grouping arrangements that teachers can use. It covers the teacher's action zone, which students they interact with most, and how this can disadvantage some learners. It also discusses learner interactional competence and different patterns students may exhibit, such as being task-oriented, phantom, social, or dependent learners. Finally, it discusses different grouping arrangements teachers can use, such as whole class, group work, or individual work, and factors to consider when choosing arrangements.