Content Validity Evidence for the Verbal Behavior Milestones Assessment and Placement Program
A 13-expert panel rated VB-MAPP content validity moderate to strong across the Milestones, EESA, and Barriers Assessment, though a few domains were under-represented.
01Research in Context
What this study did
Padilla et al. (2021) asked experts to judge the VB-MAPP.
They used an online survey. Panelists rated how well each test item matched the skill it claims to measure.
The goal was to see if the tool truly covers the verbal milestones we say it does.
What they found
Experts said the VB-MAPP has moderate-to-strong content validity overall.
A few domains came up short; some skills were under-represented.
The gaps remind you to double-check those spots when you write goals.
How this fits with other research
Dixon et al. (2018) and Anonymous (2024) both used VB-MAPP scores to show real language gains after treatment. Their positive results make more sense once you know the test itself is valid.
Lewon et al. (2021) also checked an ABA assessment, the Early Learning Measure. Like Padilla, they found solid psychometrics, giving you two vetted tools for early learners.
Duker (1999) built an earlier verbal scale, VerBAS. VB-MAPP now fills the same space with finer milestones and stronger expert backing.
Why it matters
You can keep using the VB-MAPP with confidence. Just peek at the thin spots the experts flagged and add probes or tasks there. Pair it with early predictors like vocal imitation, and you will craft tighter, evidence-based language programs.
What Content Validity Means for the VB-MAPP
Content validity asks whether an assessment's items actually represent the skill domains they claim to measure. For the VB-MAPP, a national panel of 13 experts judged domain relevance, age appropriateness, method of measurement, and how well items covered each domain.
This matters because the VB-MAPP drives language-program planning. If items miss part of a domain, placement decisions built on that score can under- or overstate a learner's true repertoire.
Where the VB-MAPP Is Strong and Where It Falls Short
Ratings were moderate to strong across the three Milestones levels, the Early Echoic Skills Assessment (EESA), and the Barriers Assessment. Overall, expert judgment supported the tool as relevant to its target behaviors.
A few domains showed limited or conflicting support and may not be fully represented by their items. BCBAs should treat VB-MAPP results as strong but not exhaustive, and supplement with direct observation where a domain looks thin.
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Open your last VB-MAPP report, add a quick probe for any domain you rarely test, and slot one teaching trial for that skill this week.
02At a glance
03Original abstract
The purpose of this study is to provide content validity evidence for the Verbal Behavior Milestones Assessment and Placement Program (VB-MAPP). A national panel of 13 experts provided an evaluation of the domain relevance, age appropriateness, method of measurement appropriateness, and domain representation across the three levels of the Milestones Assessment, Early Echoic Skills Assessment (EESA), and Barriers Assessment. Overall, the content validity evidence for the VB-MAPP Milestones, EESA, and Barriers Assessment was moderate to strong across the evaluated areas although there were areas with limited or conflicting support. The evidence suggests that the scores of the VB-MAPP provide information relevant to the target behaviors of interest but a few domains may not be fully represented by their specific items.
Journal of Autism and Developmental Disorders, 2021 · doi:10.1007/s10803-020-04864-y