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The Verbal Behavior Assessment Scale (VerBAS): construct validity, reliability, and internal consistency.

P C Duker1

  • 1University of Nijmegen, The Netherlands.

Research in Developmental Disabilities
|October 30, 1999
PubMed
Summary

The Verbal Behavior Assessment Scale effectively measures communication functions in individuals with developmental disabilities. This new scale shows good reliability and distinguishes three key communicative functions.

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Area of Science:

  • Psychology
  • Developmental Disabilities Research
  • Behavioral Assessment

Background:

  • Assessing communicative functions is crucial for individuals with developmental disabilities and severe mental handicap.
  • Existing assessment tools may not adequately capture the nuances of verbal behavior in this population.

Purpose of the Study:

  • To develop and validate the Verbal Behavior Assessment Scale (VBAS).
  • To assess the psychometric properties of the VBAS for individuals with developmental disabilities and severe mental handicap.

Main Methods:

  • The Verbal Behavior Assessment Scale, a 15-item questionnaire, was developed.
  • The scale was administered to pairs of caregivers for 115 participants.
  • Exploratory factor analysis was conducted on an additional 11 participants.

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Main Results:

  • The VBAS demonstrated satisfactory evidence for distinguishing three communicative functions within the sample.
  • The questionnaire exhibited good interrater reliability.
  • The internal consistency of the VBAS was found to be good.

Conclusions:

  • The Verbal Behavior Assessment Scale is a reliable and valid instrument for assessing communicative functions in individuals with developmental disabilities and severe mental handicap.
  • The scale successfully differentiates between three distinct communicative functions.
  • The VBAS provides a valuable tool for clinicians and researchers in the field.