This document discusses reinforcement, a concept in operant conditioning where behaviors are increased or strengthened. It defines reinforcement and explains that B.F. Skinner is considered the founder of operant conditioning theory. The document outlines the main types of reinforcement - positive and negative reinforcement, whether verbal or non-verbal. It provides examples of positive verbal reinforcement like "good job" and positive non-verbal cues like nodding. Negative reinforcement examples include verbal cues like "no" or non-verbal reactions like raising eyebrows. The document concludes with a sample micro-plan of pupil-teacher interactions using reinforcement.