"Juggernaut" is an English adaptation of "Jagannath," a traditional Indian divinity associated with the notion of irresistible or unstoppable force; and a product juggernaut is simply a company that keeps winning over its competitors through the sheer superiority of its product offering. At Arthur D. Little, we have been privileged to work side–by–side with actual and aspiring product juggernauts throughout the world, helping them mobilize their organizations to generate steady streams of market winners. Through this experience, we have defined some best practices in the increasingly ferocious product battle. In this article1 we highlight the main characteristics of product juggernauts and focus on their unique capability: a very effective process for imagining, conceiving, developing, and launching new product offerings. We also outline ways to build such a capability within your own organization.