There are several psychometric implications of this principle, one of which is the following that has to do with concurrent validity. Scaled scores of 10 on any of the Wechsler subtests are "average." However, if a youngster obtains subtest scaled scores of 10 on Block Design and Object Assembly (i.e., "normal" scores) within a context of subtest scaled scores of 14 on Information and Vocabulary, the likelihood of an eventual classification of NLD is considerably higher than would be the case were the latter (Verbal) scaled scores 10 instead of 14. In short, this is an example where pattern of performance is a much more important consideration than is level (even when that level is "normal") with respect to the classification of NLD. Indeed, it is an example of where "more" (in this case, a Verbal subtest scaled score of 14 instead of 10) is indicative of a much greater probability of NLD than is "less."

Addendum
Many clinicians are familiar with persons who exhibit the syndrome of NLD and are thought to be “very bright”—that is, have measured IQs within the above-average, even superior, range.  The syndrome of NLD is also more or less evident in persons who are thought to exhibit “intellectual disability” (e.g., Fetal Alcohol syndrome, Kabuki syndrome, see NLD and Neurological Disease for these and other examples).  These are syndromes wherein “level” (of IQ) is far less important than is “pattern of performance” (as in visual-spatial-organizational vs. rote verbal skills) in the determination of the presence or absence of the syndrome of NLD in the behavioural phenotype of the disorder.