Final answer:
Positive reinforcement through encouragement and praise for being on time can solidify better habits, along with discussing the importance of punctuality. A reward may not be necessary if the student understands and values good punctuality habits.
Step-by-step explanation:
When it comes to a student who has previously been late but is on time today, a balanced approach should be taken. Encouraging the student to continue this positive behavior is crucial, as positive reinforcement can help to solidify new, better habits. By acknowledging the student's effort to be on time today, we not only praise their achievement but also potentially boost their motivation to maintain this new pattern. It's also essential to discuss the importance of punctuality and its impact on their education and future responsibilities, such as attending work reliably. While giving a reward could be a short-term incentive, it may not be necessary every time, especially since intrinsic motivation and understanding the value of good habits can lead to longer-lasting change.