Have you ever noticed that people absorb and remember things most easily in clusters of three? Think about phone numbers. The 3-digit area code? The 3-digit exchange code? The 4-digit line code? That last one becomes much harder to recall, and the one people are most likely to get wrong. The Triad Principle (aka the rule of three) is a general communication rule which states that concepts or ideas presented in threes are inherently more interesting, more enjoyable, and more memorable. When presenting new ideas or information in your marketing, try to use groups of three. There may be times where groups of three don't work or make sense, but that's okay. Rules can be broken. It just makes the recall process harder for the recipients of your message.