Amazon.com description: Product Description: Closely watched by the stock market and obsessed over by the biggest companies, brand identity is the one indisputable source of sustainable competitive advantage, the vital key to customer loyalty. An expert in this burgeoning field, David Aaker now prepares managers for the next wave of the brand revolution. With co-author Erich Joachimsthaler, Aaker takes brand management to the next level - strategic brand leadership. The authors offer their conceptualization of "brand architecture" - how multiple brands relate to each other - as well as insights on the new area of internet branding.