We have been working on integrity with our 5 and 7 year olds. We have explained many times that integrity is doing the right thing even if no one is watching them. Some times, we peer around the corner and just ask them if they are showing integrity. It causes them to think and remember what we are trying to teach. It doesn't hurt anything that they are learning it through listening to the Dave Ramsey "Junior" CD's they got for Christmas.