analyzes whether the hospital should buy disposable gowns or reusable gowns. If the findings favor disposable gowns, then the operating-room administrator compares various competitors' products and prices and makes a choice. This administrator con- siders absorbency, antiseptic quality, design, and cost and normally buys the brand that meets functional requirements at the lowest cost. Surgeons influence the decision retroactively by reporting their satisfaction with the particular brand. The business marketer is not likely to know exactly what kind of group dynamics take place during the decision process, although whatever information he or she can obtain about personal- ities and interpersonal factors is useful. Small sellers concentrate on reaching the key buying influencers. Larger sellers go for multilevel in-depth selling to reach as many participants as possible. Their salespeople virtually "live with high-volume customers. Companies must rely more heavily on their communications programs to reach hidden buying influences and keep current customers informed. Business marketers must periodically review their assumptions about buying center participants For years Kodak sold X-ray film to hospital lab technicians, but research indicated that professional administrators were increasingly making purchasing d Kodak revised its marketing strategy and developed new advertising to reach out to these decision makers