How did the monitorial system use older pupils to teach younger pupils?

The monitorial system was a 19th-century teaching method designed to address shortages in adult educators and public funding. Its operation relied on a hierarchical structure of knowledge transfer:12

• Instruction of Monitors: A principal teacher provided direct instruction to a select group of superior, older students, known as "monitors".12
• Peer Instruction: These monitors then transmitted the knowledge they had just acquired to larger groups of younger or less advanced pupils.12

Promoted extensively by the English educator Joseph Lancaster, the system emphasized efficiency through facts, drill, repetition, and mechanical learning. While it was criticized for its reliance on rote learning and the loss of instructional time for the monitors, the system was instrumental in providing basic literacy to large numbers of children during a period when professional teacher training was limited. By approximately 1840, the monitorial system began to be replaced by the "pupil-teacher" model, which involved more formal apprenticeships for students interested in pursuing teaching as a profession.12