Inter-Rater Agreement for the Milestones and Barriers Assessments of the Verbal Behavior Milestones Assessment and Placement Program (VB-MAPP)

  • Khrystle L. Montallana
  • Brendan M. Gard
  • Amin D. LotfizadehEmail author
  • Alan Poling


We determined inter-rater agreement for the VB-MAPP, an instrument sometimes used in planning educational goals and evaluating intervention effects for young people with autism. A pair of raters independently rated each of 32 children diagnosed with autism. Intraclass correlation coefficients for the total Milestones and Barrier scores were 0.876 and 0.629, respectively, indicating good and moderate reliability. There was variability in reliability in the different domains of the Milestones Assessment, with most indicating moderate reliability, and most of the individual Barriers Assessment domains indicating poor reliability. These are the first data relevant to the reliability of the VB-MAPP, they suggest that further evaluation of its reliability is merited and that a high reliability for individual domains should not be assumed.


Verbal Behavior Milestones Assessment and Placement Program Language assessment Verbal behavior Autism spectrum disorder Inter-rater agreement Reliability 



Special thanks to Alyssa Kavner for her assistance with data entry and IOA calculations.

Author Contributions

All authors contributed equally to this study and to the preparation of this manuscript.

Compliance with Ethical Standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical Approval

All procedures performed were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This study was approved by a Human Subjects Institutional Review Board (HSIRB).

Informed Consent

Informed consent was obtained from all individual participants included in the study prior to the start of services.


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Khrystle L. Montallana
    • 1
  • Brendan M. Gard
    • 2
  • Amin D. Lotfizadeh
    • 3
    Email author
  • Alan Poling
    • 4
  1. 1.Autism Services Training DivisionEasterseals Southern CaliforniaValenciaUSA
  2. 2.Autism Services Assessment DivisionEasterseals Southern CaliforniaOxnardUSA
  3. 3.Autism Services Research DivisionEasterseals Southern CaliforniaValenciaUSA
  4. 4.Psychology DepartmentWestern Michigan UniversityKalamazooUSA

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