jeffrey, great post and making mistakes is critical to the overall learning process. No one likes to make a mistake but in the instance of learning is is somewhat a requirement to ensure maximum learning is achieved. A study of brain function is very matter of fact with it comes to learning after making a mistake and we must rely on the data driven research with it comes to best practices in how the brain works. I often tell my students on day one, making a mistake is part of learning and the grading scale takes making mistakes into consideration. Students can still achieve a high grade making mistakes. The real focus is learning from the mistakes which is highly rewarded. James Jackson