Why did the monitorial system use students to teach other students?

The monitorial system, which gained prominence in the 19th century, utilized students to teach their peers primarily for reasons of economy and efficiency.1

Educators like Joseph Lancaster developed this method because they lacked the financial resources to hire a sufficient number of adult teachers to manage large groups of children. By training superior students—known as monitors—to relay lessons learned from the principal teacher to smaller groups of pupils, schools could accommodate hundreds or even thousands of children in a single room.12

This approach offered several practical advantages:
* Cost-effectiveness: It significantly reduced the number of paid adult staff required to operate a school.1
* Time management: It prevented the "wasted" time that occurred when students had to wait for the direct attention of the head teacher.1
* Organization: The system allowed for a highly routinized, military-style classroom environment where monitors also handled administrative tasks like taking attendance and distributing materials.2

While the system successfully expanded access to basic education for many poor children, it was eventually criticized for reducing learning to rote memorization and drill.12