2) Understanding it.

“For a concept that is the foundation of virtually all aspects of our measurement work, it seems that the term validity continues to be one of the most misunderstood or widely misused of all.” (Frisbie, 2005, p. 21)

Notes:

Along with the difficulty in applying the principles of validity—“Doing It”—the second issue is “Understanding It.” It is remarkable how many misunderstandings there are about validity. According to Dave Frisbie’s presidential address to the National Council on Measurement in Education, …. validity continues to be the most widely misunderstood or misused term of all.