One Challenge that I am not sure was addressed in the class was how to teach something to someone when they are convinced they already know it and or what they know to be correct is actually incorrect. For instance, one of the biggest challenges I have seems quite simple, the colours of light can be broken down into 3 colours, Red Green and Blue. However when it comes to pigment we have been taught since kindergarten the 3 primaries are Red Blue and Yellow. I use a mnemonic device that I created specifically for the issue that works for 80% of the students right away, 18% of the students eventually understand the relationship of the colours, yet 2% just cannot make the switch. This is a relatively benign issue for a graphic artist or photographer, yet it could be a matter of life and death when it comes to medical training and the like.