Definition: Data is taken on behavior in intervals of time (i.e., ever 10 seconds or every 1 minute). A behavior is recorded as ‘occurring’ if it occurs for the entire interval of time. If the behavior is recorded as occurring for two 10-second intervals in a minute then this can be calculated as the behavior occurring 20 seconds every minute.
Why it matters: It provides an estimate of time/duration but, if the intervals are not small enough, could result in an underestimate of duration.
Example of use: A teacher is measuring on-task behavior for a student using whole interval data collection for a 10 second intervals in her class.
Gast, D. L., Ledford, J., & ebrary, I. (2014). Single case research methodology [electronic resource]: Applications in special education and behavioral sciences. New York, NY: Routledge.
Gresham, F. M., Watson, T. S., & Skinner, C. H. (2001). Functional Behavioral Assessment: Principles, Procedures, and Future Directions. School Psychology Review, 30(2), 156.