2.  The single most important characteristic of a test.
 The degree to which a test measures what it is
supposed to measure.

4. Content Validity
 The degree to which test items match some objective
criterion, such as content of a course or textbook, the
skills to do a certain job, or knowledge deemed
essential for some purpose.
 Usually established by comparing the knowledge,
skills, and values tested by the test items and those
covered in the syllabus/ course of study or textbook.

5. Construct Validity
 The degree to which a test measures an attribute or
quality it is supposed to measure
 High when a test not only correlates with other
measures with which it is supposed to correlate, but
also fails to correlate with measures of the concepts,
from which it is supposed to be different.

6. Predictive Validity
 The degree or extent to which scores on a test can
predict later behavior or test scores.

7. Concurrent Validity
 The degree of relationship between scores on a test or
scale and scores on another measure of established
validity given at about the same time.