Observers used a unique task analysis for each participant that allowed observers to score each intervention step as (1) implemented as written every time, (2) not implemented as written sometimes or never, or (3) no opportunity to observe, teacher had no opportunity to exhibit. Treatment integrity was calculated by dividing the number of intervention steps implemented as written (every time) by the total number of intervention steps implemented, and this ratio was converted to a percentage.
At the conclusion of the study, participants completed a 15-item treatment acceptability questionnaire adapted from the Intervention Rating Profile-15 (Martens, Witt, Elliot, & Darveaux, 1985) to assess the acceptability of the training strategies used to improve treatment integrity. Items were rated on a Likert-type scale ranging from 1 (strongly disagree) to 6 (strongly agree), with higher scores representing intervention acceptability. All 3 participants received the form 1 day after the final participant's follow-up probe and returned it anonymously through interoffice mail.