Levels of Strategy

Does an organization have one strategy or many? One of our new trainers, Allan Elder, asks:
While searching for blogs on strategy I discovered many specialty sites focusing on topics such as "Internet," "branding," and "supply chain," strategy sites and the list goes on. Does a company have "A" strategy or does it have many strategies? Should marketing, purchasing, HR, and all the other functions have a separate strategy or should the business have a strategy?
The simple answer is that not only does a organization have multiple strategies, but every person within that organization has multiple strategies. Not only that but those "strategies" change from moment to moment. As sales person, for example, may have an overall strategy for his territory, but he may have more specific strategies for different types of accounts within his territory. The better the sales person, the more strategies he has. A great sales person has, not only a different strategy for each customer, but a different strategy for each sales call. There are strategies within strategies like wheels within wheels. The problem is confusion about what "strategy" means. We use the term very specifically to mean "a methodology for improving a competitive position." Others use the term to mean anything from an idea to a plan to a mission. One of the benefits of learning Sun Tzu's strategy is that it provides a much clearer, more consistent terminology for discussing competitive issues. Sun Tzu's strategy is a specific design for a methodology for improving a competitive position, but you can implement that design in any number of specific ways. By definition, every position demands a different application of that general method. Each of those applications can be accurately describes as a strategy designed for a specific situation. Grand strategies applying to the overall position of a larger organization change much more slowly that the many moving parts of separate strategies within them, but those overall strategies must change over time as well as the general environment changes.