Welcome to PEDI-CAT

Pediatric Evaluation of Disability Inventory – Computer Adaptive Test

The Pediatric Evaluation of Disability Inventory (PEDI), originally published in 1992, has been revised as a computer adaptive test (CAT)-the PEDI-CAT.  The PEDI-CAT measures abilities in the three functional domains of Daily Activities, Mobility and Social/Cognitive.  The PEDI-CAT’s Responsibility domain measures the extent to which the caregiver or child takes responsibility for managing complex, multi-step life tasks.  The PEDI-CAT can be used across all clinical diagnoses and community settings.  As with the original paper-pencil PEDI, the PEDI-CAT can be administered by professional judgment of clinicians or educators who are familiar with the child or by parent report.

This computerized adaptive version of the PEDI is intended to provide an accurate and precise assessment while increasing efficiency and reducing respondent burden. The PEDI-CAT software utilizes Item Response Theory (IRT) statistical models to estimate a child’s abilities from a minimal number of the most relevant items or from a set number of items within each domain.  All respondents begin with the same item in each domain in the middle of the range of difficulty or responsibility and the response to that item then dictates which item will appear next (a harder or easier item), thus tailoring the items to the child and avoiding irrelevant items. The CAT program then displays the results instantly.

Intended Population

The PEDI-CAT is designed for use with  children and youth (birth through 20 years of age) with a variety of physical and/or behavioral conditions.


• Identification of functional delay
• Examination of improvement for an individual child after intervention
• Evaluation and monitoring of group progress in program evaluation and research


• Normative standard scores, provided as age percentiles and T scores, are available for 21
age groups (intervals of one year).
• Scaled scores are based on data from the normative and disability samples.
• Each PEDI-CAT domain is self-contained and can be used separately or along with the other domains.
• Age, gender and mobility device filters prevent irrelevant items from being presented.
• Items are worded using everyday language and clear examples.
• Illustrations of Daily Activities and Mobility items are included to facilitate understanding of the item intent.
• The PEDI-CAT is available  for iPads and PCs. Each download includes English and Spanish languages.

  • Authors

    • Senior AuthorsStephen M. Haley PhD, PT, FAPTA Wendy J. Coster PhD, OTR/L, FAOTA Helene M. Dumas PT, MS Maria A. Fragala-Pinkham PT, DPT, MS Richard Moed MPA
    • Contributing Authors Jessica Kramer PhD, OTR/L Pengsheng Ni MD Ying-Chia Kao MA, OT Tian Feng MS Larry H. Ludlow PhD
  • Domains

    • Daily ActivitiesGetting Dressed, Keeping Clean,Home Tasks, and Eating & Mealtime
    • MobilityBasic Movement & Transfers, Standing & Walking, Steps & Inclines, Running & Playing and Wheelchair
    • Social/CognitiveInteraction, Communication,Everyday Cognition, and Self Management
    • ResponsibilityOrganization & Planning, Taking Care of Daily Needs, Health Management, and Staying Safe
  • Videos