ISM periodically issues revised and updated versions of its Stability Markers, a list of evidence-based variables that, according to ISM data, comprise the critical elements in underwriting a private-independent school’s long-term viability. The ISM Stability Markers have been in widespread use by Boards of Trustees and senior administrators, both as a lens through which to self-evaluate and as a vector on which to move to strengthen a school’s longest-term financial and organizational stability and excellence. ISM here offers its first update and revision of the ISM Success Predictors—not to be confused with the Stability Markers—which represent ISM’s deliberately considered speculation on what will be needed in private-independent schools as they adjust to the always-changing technological, educational, and cultural milieu in which they move. The ISM Success Predicators, unlike the ISM Stability Markers, are not evidence-driven in the same way, i.e., not as outcomes of data analysis. Since evidence of efficacy is impossible to gather before widespread use, readers should understand the ISM Success Predictors are forecasts—not conclusions-from-data—of what ISM expects to be needed to achieve long-term success in the private-independent school marketplace.