The Concept of Validity
Lissitz, Robert W. Validity is widely held to be the most important criterion for an assessment. Nevertheless, assessment professionals have disagreed about the meaning of validity almost from theintroduction of the term as applied to testing about 100 years ago. Over the years, the best andbrightest people in assessment have contributed their thinking to this problem and the fact thatthey have not agreed is testimony to the complexity and importance of validity...