Abstract
Different variations of the experimental functional analysis (FA) methodology have been evaluated as an attempt to reduce the amount of time and resources required for its implementation. One of these variations includes the use of latency as an index of problem behavior. When measuring latency from the start of the session to the first response, the participant may be required to respond multiple times until clear differentiation is determined. The purpose of this study was to assess whether latency and interresponse time (IRT) measures would correlate with results obtained in a standard FA. Four children (ages 4-6) diagnosed with autism were exposed to an IRT functional analysis and then to a standard FA. Results showed that for three out of the four participants all variations of FA pointed out to the same function replicating previous studies supporting the effectiveness of different variations of the standard FA methodology.