The document discusses reinforcement and its role in operant conditioning and behavior analysis. There are two types of reinforcement - positive reinforcement, which involves adding a reward to increase a desired behavior, and negative reinforcement, which involves removing an undesired stimulus to increase a behavior. Proper application of reinforcement in the classroom involves providing a safe, orderly environment with clear rules to facilitate learning. Both positive and negative reinforcement can be used effectively in the classroom if applied appropriately.