Last month I described the value of self-check exercises, problems, and questions that allow learners to assess their knowledge, get feedback, and make use of additional resources or help. These exercises are typically optional but can be very powerful as a learning tool. Providing these exercises online, with self-grading and automatic feedback mechanisms, has many advantages. The advantages for learners are increased confidence, motivation, and persistence. The advantages to online instructors include having learners who require less hand-holding and reduced student attrition.