Development of the Dimensions of Success (DoS) Observation Tool for the Out of School Time STEM Field: Refinement, Field-testing and Establishment of Psychometric Properties

The Dimensions of Success (DoS) observation tool defines and provides rubrics (with levels 1-4) for 12 dimensions that were developed to measure STEM program quality in out-of-school time. This technical report summarizes the development of the instrument and findings from our initial study that included 284 observations in the field across 58 STEM programs in two geographic regions (New England and the Midwest). Data were collected by 46 trained observers who observed in pairs. This report is the initial step in developing a validity argument for the instrument.