A Study of Extreme Cases of Unreliability

The two forms of the National Intelligence are used to find out the possible causes of unreliability in different tests. The author believes that some training in taking tests should be given so that the pupils might know the significance of the directions. It is shown that the general condition of the individual has no influence on the results of testing under ordinary school conditions. Pupils who do poorly on one test in relation to their ability do very well on another test. Differences in the speed of work, and differences in accuracy are the causes of unreliability. The differences are due to slowness in getting the mechanical operations of the test, inability to understand the mental processes necessary, failure to become adjusted to taking the test. From Psych Bulletin 21:09:01054.