Design choices made by instructors when designing their specifications grading systems may also contribute to some of the increased student stress and anxiety about grades. For example, setting the passing threshold of an assignment to 100% would send the message to students that perfection is required and could easily lead to students' feeling that they will never pass an assignment or the course. Additionally, providing unlimited attempts or unlimited time with no clear due dates may remove structure that students need to stay on track and avoid procrastination. These observations suggest that setting an appropriate passing threshold for an assignment and providing structure around assignment attempts are critical design choices.