Year | definition | source |
---|---|---|
1981 | "The extent to which a test (or any other assessment technique) really touches upon the student qualities it is meant to assess" | Rowntree, D. (1981, p.339) |
1988 | "A measure is valid if it does what it is intended to do. Alternatively stated, an indicator of some abstract concept is valid to the extent that it measured what it purports to measure." | Zeller, R. A. (1988, p.322) |