There is a commonly passed around "stat" that, according to a blog post I recently read, isn't true. You've probably seen it or heard it. It is said that people remember: 10% of what they read 20% of what they hear 30% of what they see 50% of what they see and hear 70% of what they write and say 90% of what they say as they do The blog author says: Quite where these numbers come from is a mystery to many, and indeed it is difficult to understand what 90% retention actually means… 90% of what for how long? As a model it looks and on first thought appears to be credible, however as many of us will know some people have almost 100% retention for a considerable period of time if they read something, others teach others from a structure or procedure which they themselves do not understand! Thanks, RapidBI, for pointing out this common misconception!