Inter rater reliability the degree to which two independent observers agree. Test retest reliability measure the extent to which people being observed twice or taking the same test, score in the same way. Alternate form reliability extent to which score on two forms are consistent: same test but different questions, adds some difference but maintains consistency. Internal consistency reliability whether items on attest are related to one another. Criterion validity does it measure what its supposed to. Context validity whether a measure of samples meets a domain of interest. Construct when we want to interpret a test as a measure of some characteristic or construct. Clinical interviews, the interviewer pays attention to how the respondent answers or does not answer. Standardization when statistical norms for a test can be established from the data collected. Personality inventory person completes a self report questionnaire: the mmpi. Used to screen large groups of people.