I'm studying to be a (biology) teacher and learning to use the didactic method is big part of our training. In fact this entire partim (December until now) has dealt with giving clear instructions, asking the right questions, etc. We'd give classes to each other and then let the other students point out anything that isn't crystal clear. Whenever I study something I try to write it down as if I was explaining it to a six year old child. If I can't then there is still something I don't quite understand.