Keller (1998) gives other examples of extensions that have expanded the meaning of their brands (Figure 6.1). The Weight Watchers brand had a very clear meaning to those who followed its weight-watching programs. In 1978 Heinz bought Weight Watchers and transferred that meaning to a large range of food products targeted at the weight wary. An interpretation of the meaning of the Caterpillar brand in the apparel arena gave rise to Caterpillar boots. As another example of brand meaning being modified through brand extension, consider how the meaning of the IBM brand changed significantly after the introduction of the IBM personal computer. In general, the more successful the brand extension, the more likely it is to confirm or redefine the meaning of the core brand