validity
extent to which a concept, conclusion or measurement is well-founded and corresponds accurately to the real world
external validity
validity of applying the conclusions of a scientific study outside the context of that study
face validity
extent to which a test is subjectively viewed as covering the concept it purports to measure
predictive validity
extent to which a score on a scale or test predicts scores on some other measure
construct validity
the degree to which a test measures what it claims, or purports, to be measuring
content validity
measure has all parts of the construct
Internal validity
extent to which a piece of evidence supports a claim about cause and effect