The Caveris ICAS Security Assurance Index (SAI) is the quantitative rating used to provide an assessment of an Organisation’s Information Security posture. Every time a Control Instance completes, it is given a score (1 for a  good completion & 0 for a bad completion). These scores are used to calculate the SAI for each Control. The SAI scores are then propagated up through the hierarchy using the Caveris ICAS weightings to give a quantitative assessment at each level.