Continuous vs. Discontinuous Measurement — RBT Measurement Guide

Choosing the Right Measurement Procedure

Data collection is a core RBT responsibility. Measurements fall into two broad categories: continuous measurement and discontinuous measurement. Knowing when to use each is a frequent topic on the RBT practice exam.

Continuous Measurement

Continuous measurement records every instance of a behavior during the observation period. Procedures include Frequency (count), Duration (length of time), Latency (time to start), and Inter-Response Time (time between responses). It is most accurate for behaviors with a clear beginning and end.

Discontinuous Measurement

Discontinuous measurement records a sample of behavior. It does not catch every instance. Procedures include Partial Interval, Whole Interval, and Momentary Time Sampling. This is often used for behaviors that occur at high rates or for long durations.

Key Differences

Continuous measurement is more accurate but requires constant attention. Discontinuous measurement is easier to manage while performing other tasks but may over- or underestimate behavior.

Scenario Application

If a question asks about measuring a tantrum that varies in length, duration (continuous) is likely the best choice. If measuring a student staying in their seat during a 30-minute lesson, whole interval recording might be used.