The fact is, while some habits are almost unbreakable, some habits remain fragile, even after years. We must guard against anything that might weaken a valuable habit. Every added link in the chain strengthens the habit—and any break in the chain marks a potential stopping point. For many people, don’t-break-the-chain is a powerful strategy—for the same reason that some people want to get the attendance award in grade school. It’s very satisfying to have a perfect record.