Who administers the Bayley Scales of Infant Development III?

• A. Psychologist
• B. Pediatrician
• C. Nurse
• D. Teacher

Answer: (A)

The Bayley Scales of Infant Development III require a professional with formal training in developmental assessment and psychometrics. Because the test is standardized and norm-referenced, its administration, scoring, and interpretation must follow strict procedures to ensure accuracy and reliability. A psychologist is the most typical examiner, as they are trained to administer the tasks precisely, score according to the manual, and interpret the results against developmental norms. While pediatricians may refer for evaluation and may be involved in interpreting results, the actual administration is done by a trained examiner. Nurses or teachers generally do not have the specialized training needed to administer this instrument properly, so they aren’t appropriate for administering the Bayley-III.