The MMPI and SII are examples. Projective tests utilize ambiguous stimuli, assuming the way subjects structure and interpret stimuli are revealing. Reliability Reliability refers to consistency in measurement. If the thing being tested doesn't change, then the reliable test will give the same results repeatedly. To the extent that the measurement is consistent, the test is reliable.
Reliability usually refers to consistency over time .
Hence, testing and re-testing is a way to check for reliability. Sometimes we refer to reliability over situation . Reliability is necessary but not sufficient for validity. The validity of a test tells us how well the test measures what it is supposed to measure. Your intelligence could be reliably assessed by your height, but that would not be valid.