“…Arter and Jenkins (1979) question the entire diagnostic testing-prescriptive teaching model in which deficits on such measures are assumed to be related to deficits in academic achievement. Despite claims of correlational evidence for the relationship between these measures and indices of academic achievement (Beery, 1967;Koppitz, 1964Koppitz, , 1975Snyder, Massong, & Ashmore, 1980), Arter and Jenkins (1979) argue that "mere statistical significance is not evidence for validity." They recommend a criterion established by Guilford (1956) that a correlation coefficient of .35 be considered as a minimum cutoff for criterion validity, and that, where appropriate, extraneous variables such as intelligence be controlled for to avoid spuriously inflated correlations.…”