For CAEP purposes, measures of candidate performance across successive administrations. Measures gain credibility as additional sources or methods for generating evidence of performance are employed. Triangulating with multiple measures helps guard against the inevitable flaws associated with any one approach. The same principle applies to qualitative evidence whose ÒweightÓ is enhanced as new cases or testimonies are added and when such additions are drawn from different sources. In sum, the entire set of measures used under a given Standard should be mutually reinforcing.