ISM periodically re-analyzes, reconfigures, and updates its list of Stability Markers. The ISM Stability Markers® are in continual and widespread use in the private-independent school world as reliable guideposts in strategic planning and strategic financial planning. As Board President or School Head, you may find it helpful to consider the Stability Markers’ opposite extremes—private-independent school practices that, from ISM’s perspective, are likely to contribute to “strategic instability.” This article may be especially useful in teaching situations, such as in your annual new-Trustee orientation or in presentations to constituents outside the Board and senior administration.