With its roots in modern behaviorist psychology, O.B. Mod. is a human resources management technique aimed at improving job-related behaviors that are observable and measurable, such as absenteeism or tardiness, or toward behavior products, such as quality or quantity of work. O.B. Mod calls for intervention to encourage desirable performance behavior and discourage undesirable behavior. The major intervention strategy involves (1) feedback on the critical performance-related behavior and (2) positive reinforcement for progress and attainment.