Final answer:
The subject of this question is operant conditioning. Harry's strategy of acknowledging Karen's punctuality is an example of intermittent reinforcement, which is an effective method to increase the likelihood of a behavior being repeated.
Step-by-step explanation:
The subject of this question is operant conditioning. Operant conditioning is a learning process in which behavior is strengthened or weakened by the consequences that follow it. In this case, Harry is using a reinforcement strategy to address Karen's chronic lateness.
Based on the given information, Harry's strategy of acknowledging Karen's punctuality every time she isn't late for work is an example of intermittent reinforcement.
Intermittent reinforcement involves giving reinforcement only some of the time when the desired behavior occurs.
Through intermittent reinforcement, Harry aims to increase the likelihood that Karen will arrive on time consistently, as she never knows when she will be acknowledged. This method is effective because it keeps the behavior of being on time unpredictable and therefore more likely to be repeated.