ABC narrative recordings and Open-Ended Functional Assessment Interviews have limited empirical support for their concurrent validity with functional analysis. To address this issue, we conducted a study wherein 187 independent behavior analysts relied on data collected using ABC recordings and Open-Ended Functional Assessment Interviews to identify the function of challenging behavior in four children with autism. Then, we compared the results of their analyses with those of a traditional functional analysis. The analyses of the ABC recordings and of the Open-End Functional Assessment Interviews matched those of the functional analyses in 47% and 71% of cases, respectively. These findings suggest that the Open-Ended Functional Assessment Interview may perform better than the ABC narrative recording to develop hypotheses on the functions of challenging behavior.