Standardization refers to the uniform procedures used in the administration and scoring of a test both personality tests and mental abolition scales are standardized measures of behavior.
All conditions and requirements of the tests are same for every test taker so that their scores can be compared meaningfully.
Norms are standards of test performance that permit the comparison of one person's score on a test to the scores of others who have taken the same test.
Norms provide information about where a score ranks in relation to others on the same test.
Standardization of a test's scoring system includes the development of test norms.
To tell a person wheather he is avergae above or below average.
Reliability of a test refers to the measurement of consistency of a test.
Psychologists need to make sure that each time they administer a test, a test-taken will achieve the same results provided the motivation to score, health and other characteristics of the person related to the test haven't changed.
To check a test's reliability, a test is given to a person more than one times and the scores are compared being reliable is no guarantee for a test to be valid also but if its unreliable it cannot be valid.
Test to measure skill size for intelligence by sir Francis Galton.
When a test is regarded as valid, Assuming that all other factors like motivation to score well, knowledge of the material, health and to forth are all the same, if a person scores high the first time and performs poorly the second time, the test is not measuring what it is supposed to measure.
Test validity and reliability are prerequisite for accurate assessment of intelligence and all others measurements.