Final answer:
The best incentive for Idris to stop getting into trouble at school is likely a significant and special reward, such as promising to take him on a fun weekend trip, which aligns with principles of positive reinforcement and adolescent development.
Step-by-step explanation:
The question relates to the most effective incentive to encourage Idris, an adolescent student, to stop getting into trouble at school according to the principles of adolescent development. Considering the provided information which suggests that humans learn behaviors through conditioning, a suitable incentive would be one that directly ties to Idris's immediate interests and offers a concrete, achievable reward.
In this context, promising to take him on a fun weekend trip could serve as the most meaningful incentive because it is a significant and special reward that Idris could associate with the goal of maintaining good behavior, adhering to the foot-in-the-door principle where a larger reward follows good behavior. This approach aligns with behavioral psychology theories, emphasizing the effectiveness of positive reinforcement in shaping behavior.