In behavior measurement, what does the term "IRT" stand for?

The term "IRT" stands for Inter-response Time. This measurement refers to the time interval that occurs between the end of one response and the beginning of another response. Inter-response time is a key concept in behavior analysis because it helps practitioners understand the pacing and frequency of a behavior over time, providing insights into patterns of responding that can inform interventions.

For example, shorter inter-response times may indicate that a behavior is occurring rapidly and could suggest high engagement or motivation. Conversely, longer inter-response times might suggest that the individual is losing interest or encountering difficulties. By measuring IRT, behavior analysts can gain valuable data to assess the effectiveness of interventions and make necessary adjustments to support the learner's progress.