Education aims to fully develop students' abilities and personality traits, but lack of motivation can hinder achieving objectives. Reinforcement principles may help by strengthening desired behaviors. Reinforcement increases the likelihood a response will occur again by presenting a contingent stimulus. It can be positive (adding a reward) or negative (removing an unwanted stimulus). Effective reinforcement schedules include continuous, fixed-ratio, variable-ratio, fixed-interval, and variable-interval. B.F. Skinner influenced education by showing positive reinforcement is more effective than punishment at changing behaviors. Teachers can improve by using immediate positive reinforcement, continuous reinforcement programs, and reinforcing across different times and settings.