A measure proves its worth only by predicting outcomes beyond existing measures

Evidence

Another important quality that the IS has not yet demonstrated is the extent to which it predicts a related phenomenon relative to other relevant measures. This practical approach to validation, which is called incremental validity, demonstrates an instrument’s contribution and value to a given field (Haynes & Lench, 2003; Hunsley & Meyer, 2003; Piedmont, 2005). — Sherman A. Lee, Chelsea A. Reid, Stephen D. Short, Jeffrey A. Gibbons, Ruth Yeh, and Matthew L. Campbell, Fear of Muslims, 24

Categorization

• DEFINE: Defines incremental validity as demonstrated contribution over and above other relevant measures.