We used a four-phase approach to develop, operationalize, and refine the Q-CCIIT measure and collect data on its psychometric properties: an initial phase, comprising a literature review and the development of a measurement framework, and three data collection phases we refer to as the pretest, pilot test, and psychometric field test. The number of observations, geographic locations, and observers increased with each phase of data collection. With each phase, we refined the measure until we ultimately evaluated the psychometric properties of the final measure during the field test. The final field test sample included 400 classrooms (110 FCCs and 290 center-based classrooms) in 10 geographical clusters spanning 14 states and the District of Columbia. (author abstract)