“…In the area of measurement, some participants failed to complete the postinservice measures. This was attributed to the extended time required, as similarly reported elsewhere (e.g., Hemmeter, Doyle, Collins, & Ault, 1996;Javorsky, Kline, & Zentall, 2000; i.e., not a bias systematically affecting only one intervention). As well, we relied on the accuracy of teachers' tallies on the Classroom Behavior Tally Checklist, because we were not provided with consent for video observation of whole classes of students.…”