Terri, Balance and perspective are key adjectives when discussing past mistakes. We do learn from mistakes, but minimizing them and learning from the past are good teachers. Staying close to the course objectives and student learning activities is the best place to start and rely on for whatever activity we are involved with. Afterall, this is what the students will be tested on. And hopefully, these define what the course is about, what is to be taught, practed and mastered, and what the student will be able to do at course completion. Barry Westling