Scoring reliability on the WAIS-R.

WAIS-R protocols from 2 vocational counseling clients (aged 34 and 41 yrs) were scored by 19 psychologists and 20 graduate students. Regardless of scorer's experience level, mechanical scoring error produced summary scores varying by as much as 4–28 IQ points. For both protocols and both scoring groups, scoring agreement with the actual Full Scale IQ scores ranged from 32 to 35%. Over 77% of the scores were within 1 standard error of measurement (SEM) of the true scores. It is urged that IQs be reported in conjunction with a precision range based on the SEM of the test. (3 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)