We investigated administration and scoring errors on 57 WPPSI-R protocols completed by 7 examiners. These examiners made frequent errors, such as failing to record examine responses, assigning incorrect point values to examinee responses, and determining incorrect basals and/or ceilings. When examiner errors were corrected, Full Scale IQs were changed on 53% of protocols. The incorrect IQs assigned by examiners resulted in one potential diagnostic error. Examiner errors appeared to stem from three sources: examiner carelessness, inadequate training, and complex scoring procedures.
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