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Students might not use your comments constructively if too much time passes between the due date and getting feedback. Tell them when to expect a graded test or paper ahead of time. While the workload can be hard to manage, do your best to stick to your deadlines. For example, let them know that you'll have their graded papers back to them a week after the due date. Instead of praising qualities, such as intelligence, mention specific actions that you want to reinforce. Positive feedback that focuses on qualities can encourage high performers to rest on their laurels. For example, say or write, "This is a thorough, detailed explanation, and it shows you've done a lot of research. Keep up the hard work!" instead of just pointing out weaknesses. Balance positive and negative feedback, and encourage students to improve themselves. Mention places where a student did well, and tell them how they could apply those successful strategies elsewhere. For example, tell them, "Your class participation is strong, and I can tell you always do the assigned reading. However, your essays didn't include much supporting evidence. Try jotting down each reading's key points and review them when you study for the test." Instead of "Not exactly," "Clarify," or "Expand," try to make your comments as specific as possible. Say or write, "This description isn't precise. Review chapter 4, pages 155-160," or "Cut your thesis to 1 to 2 lines, and avoid using adverbs to fluff up your argument."
Give feedback as soon after a due date as possible. Praise specific efforts, behaviors, and strategies. Suggest ways to improve Avoid giving unfocused, sarcastic, or vague feedback.