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Developing tailored instruments: item banking and computerized adaptive assessment.

Jakob Bue Bjorner1, Chih-Hung Chang, David Thissen

  • 1QualityMetric Incorporated, 640 George Washington Highway, Suite 201, Lincoln, RI 02865, USA. jbjorner@qualitymetric.com

Quality of Life Research : an International Journal of Quality of Life Aspects of Treatment, Care and Rehabilitation
|May 29, 2007
PubMed
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Item banks and Computerized Adaptive Testing (CAT) enhance health outcome assessments. Developing these requires defining constructs, quality items, psychometric analysis, and clear CAT specifications for accurate measurement.

Area of Science:

  • Health outcomes assessment
  • Psychometric evaluation
  • Educational testing applications

Background:

  • Item banks and Computerized Adaptive Testing (CAT) offer significant potential for improving health outcome assessments.
  • CAT utilizes item banks to select the most relevant and informative items for each respondent, optimizing test precision.

Purpose of the Study:

  • To describe the unique features of item banks and CAT.
  • To discuss the development process for item banks.
  • To highlight opportunities and challenges in medical applications.

Main Methods:

  • Review of item bank and CAT features.
  • Discussion of item bank development stages.
  • Emphasis on Item Response Theory (IRT) for item selection and scoring.

Related Experiment Videos

  • Psychometric analysis evaluating IRT assumptions (unidimensionality, local independence, differential item functioning, model fit).

    • Main Results:

    • CAT optimizes test relevance and precision by selecting items from an item bank tailored to individual respondents.
    • Successful item bank development necessitates clear construct definition, quality items, rigorous psychometric analysis, and defined CAT specifications.
    • Psychometric analysis must validate IRT assumptions and model fit for reliable assessment.

    Conclusions:

    • Item banks and CAT, grounded in IRT, provide a robust framework for advancing health outcome assessment.
    • Careful development, including psychometric validation and interpretation guidelines, is crucial for clinical application.
    • The medical field can leverage educational testing expertise while addressing unique challenges in implementing these advanced assessment tools.