To meet the sustainability challenge, colleges and universities will have to reorient their educational programs. Institutional research (IR) can help assess and demonstrate the success of such initiatives. The change that is required in the way people view the world and their place in it is what the author calls a "sustainable mindset." A sustainable mindset is the indicator he proposes as the essential benchmark for knowing whether our institutions are educating for sustainability. He asserts that we need to create sustainable mindsets in our students; we need to approach and assess our educational activities with institutional sustainable mindsets. In this article he discusses both. After discussing the characteristics of a sustainable mindset, and the indicators we need to measure success in promoting it, the author turns to the educational processes that contribute to, or hinder the achievement of, this mindset. He concludes that many of the requisite indicators remain to be developed. IR brings distinct skills and resources to the development of such indicators. Some will come from the many surveys, especially surveys of seniors and alumni, that IR conducts or with which it is involved. Others will come from the program assessment activities. Others will come from the development of measurement and monitoring devices yet to be conceived. All will require, however, that IR engage in dialogue and collaboration with many others in the institution, especially faculty, students, and our alumni who are testing the value of their educations in the world beyond the campus. (Contains 1 figure.)