Go back on a periodic basis and observe how different groups have changed, and track the results quantitatively to show how positive deviance works. Chip away at conventional wisdom, and gradually alter low expectations by showing, in indisputable terms, the results that come with doing things differently. The Harvard School of Public Health came to the four original villages and did an independent study. They found that children who hadn't even been born when we left the villages were at the exact same enhanced nutritional levels as the ones who benefited from the program when we were there. That means that the behavior sticks.
Repeat steps one through seven.
Make the whole process cyclical. Once people discover effective ways to deviate from the norm, and once those methods have become common practice, it's time to do another study to find out how the best performers in the group are operating now. Chances are that they've discovered new deviations from the new norm. The bell curve of performance keeps moving up, as long as you disseminate the best deviations across the curve and continue to discover new examples of positive deviance among the next group of best performers. Sternin took his positive-deviance program to a total of 14 Vietnamese villages after succeeding in the initial 4.