Introduction to Psychology 10th Edition by Rod Plotnik,Haig Kouyoumdjian

Exercise 21

A good psychological test must have two qualities. One quality ensures that a person's score on a test at one point in time is similar to a score by the same person on a similar test at a later date; this is called (a) _____. The other quality ensures that a test measures what it is supposed to measure; this is called (b) _____. Although the results from analyzing handwriting may be consistent from time to time, this is a poor test of personality or intelligence because handwriting analysis lacks the quality of (c) _____.