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Which ABA data collection methods should I use?

Continuous and discontinuous measurement, when to use each, and how to keep data accurate without slowing sessions down.

By The Autism Kit teamUpdated Sep 27, 2026 · 1 min read
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The short answer

ABA data methods fall into continuous measurement (frequency, rate, duration, latency, trial-by-trial) and discontinuous measurement (partial interval, whole interval, momentary time sampling), plus permanent products. Choose based on the behavior's features and what decision the data needs to support. Accurate, consistent data matters more than collecting everything.

Key takeaways
  • Continuous methods record every instance.
  • Discontinuous methods estimate using intervals.
  • Pick the method that fits the behavior and the decision.
  • Check reliability and keep data sheets simple.

What are the main data collection methods?

Common ABA measurement methods
MethodBest forExample
Frequency or rateBehaviors with a clear start and endNumber of requests per hour
DurationHow long a behavior lastsMinutes of engagement
LatencyTime to start after an instructionSeconds to begin a transition
Trial-by-trialSkill acquisition in structured teachingCorrect and incorrect responses per trial
Partial intervalBehaviors you want to decrease; tends to overestimateDid it happen at all in the interval?
Whole intervalBehaviors you want to increase; tends to underestimateDid it last the whole interval?
Momentary time samplingOngoing behaviors in groupsIs it happening at the moment the interval ends?
Permanent productBehavior that leaves a resultWorksheets completed

RBTs learn these methods, plus calculating rate, duration and percentage, in the 2026 40-hour training.1 Measurement is also a domain on the BCBA exam.2

How do I choose?

Ask: What does the behavior look like? How often does it happen? What decision will these data support? Can staff record it accurately during the session?

How do I keep data accurate and efficient?

Try
  • Clear operational definitions everyone has practiced
  • Short, simple data sheets or a well-designed app
  • Regular interobserver agreement checks
  • Graphing data at least weekly
Skip
  • Recording data from memory after the session
  • Collecting data nobody reviews
  • Changing definitions without retraining

What can I do this week?

0 of 3 done

Read next: How do I write measurable ABA goals?

Common questions

Continuous methods capture every instance, so they're usually most accurate. Discontinuous methods estimate and can over- or under-estimate depending on the method.

Sources

  1. Behavior Analyst Certification Board: RBT 2026 40-hour training requirements and curriculum outline (data collection and graphing). bacb.com
  2. Behavior Analyst Certification Board: BCBA Test Content Outline (6th ed.). bacb.com

This guide shares general information and our team's perspective, based on the sources above. It isn't legal, billing or certification advice: always check the BACB's current requirements, your state's rules and your organization's policies. How we write our guides.

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