Dan Heath asks what happens when we take our thinking upstream and try to prevent problems before they happen. We all have a tendency to work around problems. We are resourceful. We improvise. We're so accustomed to managing emergencies as they strike that we often don't stop to think about how we could prevent crises before they happen. Why 'solve' crimes when we could stop them being committed? Why treat chronic diseases when they could be prevented from developing? Why provide shelter for the homeless rather than working to keep people housed in the first place? The notion of preventing problems is an evergreen need in our professional and daily lives. This a book for skeptical optimists - across all sectors - who know it's not going to be easy, but who believe that we have the capacity to solve some of our thorniest issues, if only we start to think about the system rather than the symptoms.