Though controversy rages about the overall contribution of charter schools to U.S. education reform, few doubt that a subset of charter schools has achieved extraordinary results with disadvantaged students. Relative to the enormous need for quality education, the number of children served by the best charter schools is far too low. Numerous growth barriers confront even the best charter institutions. The charter sector's best must aim for high exponential growth similar to that of the best growth organizations in the for-profit and nonprofit sectors. Millions more children would be reached with excellence every year if the charter sector's best pursued sustained, rapid growth. To develop fresh insights to spur growth of the charter sector's best, the authors researched the distinguishing characteristics of organizations in other sectors that have grown at sustained, high-exponential rates. This paper summarizes the lessons that emerged from that research and the authors' initial recommendations for the charter sector. (Contains 2 figures and 133 endnotes.)