The document discusses different patterns of classroom interaction and how to classify them. It identifies five forms of interaction ranging from teacher-dominated to student-active. These include: teacher very active with students receptive (TT); teacher active with students mainly receptive (T); balanced interaction between teacher and students (TS); students active with teacher mainly receptive (S); and students very active with teacher receptive (SS). The document also provides discussion questions about analyzing patterns of interaction in classroom observations.