Behaviorism is a theory that predicts and controls human behavior without considering internal mental states. Key figures who influenced behaviorism include Ivan Pavlov, known for classical conditioning using dogs, and B.F. Skinner, who developed operant conditioning using positive reinforcement with animals. Behaviorism believes all learning is objective and shaped by environmental stimuli and consequences, with no distinction between humans and animals. In the classroom, behaviorism encourages teachers to use clear instructions, positive reinforcement of goals, and not moving ahead until mastery is achieved to motivate student learning.