The ISM Stability Markers® comprise outcomes of ISM Consultants’ internal studies that periodically address the question: What variables are associated most strongly, according to ISM data, with a private-independent school’s ability to sustain excellence? This article—a snapshot of the larger array—provides readers with a self-scored estimate of the more comprehensive, 18-item set of ISM Stability Markers. This is designed to be used by the School Head, Business Manager, or other senior administrators in developing a preliminary, yet thoroughly data-driven, portrait of your school’s organizational and financial positioning for the long run.