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Computer-Based Language Assessment Software: The Effects of Presentation and Response Format.

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|January 1, 1999
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Summary

Computerized Peabody Picture Vocabulary Test-Revised (PPVT-R) versions with trackball or scanning responses are equivalent to standard formats. This allows for valid use of published norms with adapted testing methods for children.

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Area of Science:

  • Speech-language pathology
  • Educational psychology
  • Psychometrics

Background:

  • Standardized tests like the Peabody Picture Vocabulary Test-Revised (PPVT-R) often require a pointing response.
  • Speech-language pathologists (SLPs) adapt test formats for clients unable to point, but this may affect norming standards.
  • Investigating the validity of adapted formats is crucial for accurate language assessment.

Purpose of the Study:

  • To investigate the effects of computerized presentation and non-standard response formats on PPVT-R performance.
  • To determine if computerized versions with trackball or automated scanning are equivalent to the standard PPVT-R.
  • To assess the usability of published PPVT-R norms with adapted computerized test forms.

Main Methods:

  • Seventy-two typically developing children aged 4:0 to 8:11 participated.
  • Participants were randomly assigned to one of three conditions: standard pointing, computer with trackball, or computer with automated scanning.
  • Performance on the Peabody Picture Vocabulary Test-Revised (PPVT-R) Form M was analyzed across conditions.

Main Results:

  • No statistically significant differences in PPVT-R performance were found across the standard and two computerized response conditions.
  • Age was a significant factor, with older children demonstrating increased accuracy irrespective of the response format.
  • Computerized test forms were found to be statistically equivalent to the standard PPVT-R form.

Conclusions:

  • Adapted computerized response formats (trackball, automated scanning) for the PPVT-R are statistically equivalent to the standard format.
  • These computerized versions can be administered using the existing published norms for the PPVT-R.
  • This research supports the use of adapted testing methods to improve accessibility in language assessment.