To effectively use DR, a practitioner should focus on what aspect of the client's behavior?

Promoting appropriate behaviors is the primary focus in the context of Differential Reinforcement (DR). This approach emphasizes the reinforcement of desired behaviors while reducing undesired ones. By concentrating on encouraging appropriate behaviors, the practitioner can create a more positive learning environment and provide the client with the skills and strategies needed to succeed in various situations.

Differential reinforcement can include reinforcing a specific behavior that is more socially acceptable or functionally appropriate in contrast to the undesired behavior. This method helps in shaping behavior by providing rewards for positive actions, thus making them more likely to be repeated in the future.

The emphasis on promoting appropriate behaviors is critical as it aligns with the principles of Applied Behavior Analysis (ABA), focusing on constructive interventions that enhance the client's skill set and functionality. This ultimately leads to a decrease in problematic behaviors as the client learns better alternatives to express their needs or desires.