Most of us would like to be happier. Dolan defines this as experiencing more pleasure and/or purpose for longer. He describes how being happier means allocating attention more efficiently; towards those things that bring us pleasure and purpose and away from those that generate pain and pointlessness. Easier said than done, of course, and certainly easier said than thought about. But behavioural science tells us that most of what we do is not so much thought about; rather, it simply comes about. So by clever use of priming, defaults, commitments and social norms, you can become a whole lot happier without actually having to think very hard about it. You will be happier by design.