Reliability of a Group Form of the Peabody Picture Vocabulary Test

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Abstract
The purpose of this study was to obtain needed additional information concerning the reliability of the PPVT. A group testing procedure was utilized by reproducing the plates of the PPVT on 35 millimeter transparent slides and projecting them onto a 60 X 60 inch screen. A sample of 414 fourth-, fifth-, and sixth-grade pupils was tested twice with Form A and twice with Form B. The time required to administer each separate form was one-half hour. The total testing time for both Form A and Form B when combined into one longer test was one hour. Alternate form reliability compared favorably with the manual. Test-retest reliability coefficients ranged from .73 to .35. Combining the two forms into a test twice as long yielded test-retest reliability coefficients of .90, .88 and .84 for the fourth, fifth and sixth grades respectively.

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