Inter-observer agreement (IOA) data were collected during 100% of the preference assessment trials, and approximately 30% of sessions across the functional analysis and the choice analysis sessions, respectively. IOA was calculating by dividing the number of agreements by the sum of the number of agreements and disagreements and then multiplying by 100%. For Ian’s sessions,
IOA for all behaviors was 100%. For Gavin’s sessions, average IOA for all behaviors was 91% (r = 81-100%).