Sidney L. Pressey — American psychologist and pioneer of the teaching machine

The teaching machine

In the mid‑1920s Pressey built a mechanical device designed to present multiple‑choice questions and register answers. The machine was notable because it could be set to advance only when a correct response was given, thereby providing immediate feedback to the learner. This simple idea—making testing itself an instructional event—distinguished his approach from conventional examinations.

Characteristics and examples

Key features associated with Pressey's system included:

• Item presentation in a controlled sequence.
• Immediate reinforcement for correct items.
• An emphasis on individualized progress rather than whole‑class pacing.

Descriptions of that work frequently refer to his teaching machine and to demonstrations he gave to colleagues and educators. His roots in Brooklyn and New York are often mentioned in biographical notes (Brooklyn, New York).

Influence and legacy

Pressey's ideas anticipated later developments in programmed instruction and educational technology. While his mechanical device was eventually eclipsed by behaviorist and electronic implementations (for example, later machines and computer‑based systems), historians of education recognize him as an early advocate for feedback‑driven learning and for using measurement to improve instruction. Several summaries and departmental histories discuss his contributions on psychology pages such as a general department profile.

Notable distinctions

Unlike some later proponents who emphasized strict behaviorist conditioning, Pressey focused on practical classroom problems: how to make tests serve as teaching tools, how to individualize learning, and how to use simple technology to scale instruction. His work links classical achievement testing and the later field of programmed learning, making him a transitional figure in the history of educational measurement and instructional design.