Psychometric Properties of the Dutch Contextual Assessment of Social Skills (CASS): An Independent Observational Outcome Measure of Social Skills in Autistic Adolescents.

The study used only pre-treatment data, so it does not demonstrate that the measure is sensitive to change over time or effective at tracking intervention outcomes. The original frequency-count items (Asking Questions, Topic Changes) were excluded from the total score, which may limit the ability to quantify specific conversational behaviors that are often intervention targets. Raters were undergraduate students who, although masked, were part of the research team and might have inferred group assignment or timepoint from contextual clues. The confederates' behavior was not measured with a separate adherence tool, relying instead on the CASS items themselves to check consistency. Two participants declined to complete the conversation due to anxiety, highlighting that the assessment can be stressful for some adolescents.

The study was funded by a Dutch philanthropic foundation. No other conflicts of interest were reported.

Do not assume this study proves the CASS is effective for measuring treatment change. The analysis used only baseline (pre-treatment) data, so while the measure is reliable and valid at a single time point, its sensitivity to improvement after an intervention was not tested here.