Represents the expected time the group, or a member of the group, is expected to survive after the analysis date. The care and servicing by personnel for the purpose of maintaining equipment and facilities in satisfactory operating condition by providing for systematic inspection, detection, and correction of incipient failures either before they occur or before they develop into major defects. Those based upon a model of the application and the responses of the model to introduced faults or degradation. Those based upon direct sensor measurement, feature and feature vector development, and analysis and prediction based upon these parameters. Those based upon statistical treatment of data or information. A combination of any or all of the preceding three. Applicability or robustness of the prognostic technique or system – how many other applications can the technique be applied to with commensurate accuracy, reliability and horizon attributes.