Thomson discusses the importance of discipline in class both in a general sense, and specifically relating to music classes. He discusses the pitfalls of both too lenient and too harsh discipline; the importance of forming rules and ensuring these are as clear and as few as possible; the participation of pupils in rule making and reporting when rules are broken; and assigning a fitting punishment.

He also gives pointers for achieving discipline, and stresses the responsibilities the teacher must undertake, including keeping proper records of students' progress and attendance, paying attention to the class, learning their names and being observant; and ensuring students' work is properly marked and good work rewarded.