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Another simple subtraction rule is, when you write or revise the core values for your organization, don’t list more than four. And use vivid imagery to describe each value. If you are running a nonprofit, for example, don’t talk about “excellence in fundraising.” Instead, talk about donors who tell friends and neighbors that their gift was “among the best decisions they have ever made.” A short list of vivid values triggers a shared sense of purpose in employees, customers, and other stakeholders, which in turn fuels effort and coordination. That’s what University of Pennsylvania’s Andrew Carton and his coauthors concluded after studying patients treated for heart attacks in 151 California hospitals. When a hospital had four or fewer values and used vivid imagery, patients were far less likely to be readmitted for further treatment within thirty days—a key indicator of the quality of care. Carton’s team found similar results in an experiment where they assembled sixty-two virtual teams to design new toys.