Peabody Individual Achievement Test

Purpose: Designed as a measure of academic achievement.

Population: Grades K-12.

Score: 6 scores.

Time: (30-40) minutes.

Authors: Lloyd M. Dun and Frederick C. Markwardt, Jr.

Publisher: American Guidance Service, Inc.

Description: The Peabody Individual Achievement Test (PIAT) is an individually administered measure of academic achievement that is norm-referenced. The test was designed to provide a wide-range screening measure in five content areas that can be used with students in kindergarten through the twelfth grade. The content areas covered by the PIAT are 1) mathematics, 2) reading recognition, 3) reading comprehension, 4) spelling, and 5) general information. The test materials are presented in two easel-kit volumes that present the stimulus items to the students on one side while the examiner can see both the stimulus items of the students and the examiner’s instructions on the reverse side. This easel-kit format facilitates the assessment process and is easy to work with for the examiner and the student.

Scoring: The PIAT produces six scores from corresponding domains: mathematics, reading recognition, reading comprehension, spelling, general information, and a total score.

Reliability: Test-retest reliability coefficients (Pearson product-moment correlations) were calculated based on sample retesting of 50-75 students in Grades K, 1, 3, 5, 8, and 12. There was a month interval between testings. The resultant reliability coefficients ranged from .42 in kindergarten for Spelling to .94 in the third grade for Reading Recognition. The overall median reliability coefficient was .78. In terms of median coefficient values the greatest confidence in stability is in the total test (.89) and Reading Recognition (.89) and least in Reading Comprehension (.64) and Spelling (.65).

Validity: It is believed that the rigorous item selection used in the development of the PIAT supports adequate content validity. Concurrent validity was calculated by comparing the scores of the PIAT to a measure of scholastic aptitude, the Peabody Picture Vocabulary Test (PPVT), Form A. The resultant product-moment correlation coefficients ranged from a median of .42 in kindergarten to a median of .69 in third grade. The range for the subtest coefficients ranged from .40 in Spelling to a median of .68 in General Information. The overall coefficient for the subtests of the PIAT with the PPVT, Form A, was .57.

Norms: The total sample was composed of 2,559 students. These students were randomly selected from public school classrooms and balanced according to sex (50% male, 50% female), age, race (84.4% white, 11.3% black, 4.3% other), and socioeconomic level.

Suggested Uses: The PIAT is recommended as a screening measure for academic achievement in educational, clinical, and research settings.