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While project vision may shift, the motivating values underlying it — its supporting principles — serve as unchanging bedrock. Across the projects we studied, successful leaders went to great lengths to convey to participants the importance of the endeavor — often framed in terms of personal, social, or environmental values — and what was at stake.
   Consider the rescue of the 33 Chilean miners trapped in a mine collapse in 2010. Over an excruciating 70 days, experts from an array of occupations, organizations, and industries teamed up to solve an exceedingly challenging technical problem. The starting vision articulated by the team leaders — to bring the miners home alive — was explicitly framed so that it could shift, if necessary, to a different one: returning the bodies to their families. While the project vision was designed to evolve, the underlying project values — commitment, compassion, and radical innovativeness — never wavered. Despite lengthening odds against success, Andre Sougarret, the rescue leader, often highlighted the team’s purpose — saving lives — while preparing participants for the potential for a new purpose that, in its own way, would be just as important.