Over the years, I've come to the conclusion that good theory is what has been missing in the discussions about how companies can create successful innovations. Is innovation truly a crapshoot? Or is innovation difficult because we don't know what causes it to succeed? I've watched so many smart, capable managers wrestle with all kinds of innovation challenges and nagging questions, but seldom the most fundamental one: What causes a customer to purchase and use a particular product or service? We believe Jobs Theory, at last, provides an answer.