When testing operational definitions, you should include onset and offset criteria.

• A. Yes
• B. No
• C. Only if the behavior is reversible
• D. Only for reliability

Answer: (A)

Operational definitions must include onset and offset criteria so there is a precise boundary for when data collection begins and ends for each instance of the behavior. This clarity lets observers consistently decide when to start recording and when to stop, which directly supports reliable data across observers and sessions. Onset criteria specify what signals the start of the behavior or measurement window; offset criteria specify when that instance ends. With these boundaries, you can distinguish one occurrence from another and measure duration accurately. Even for behaviors that are reversible, you still need clear onset and offset to avoid drifting measurements and to allow replication. Relying on vague or implicit boundaries would lead to inconsistent recording and biased results, which is why this is essential for any operational definition.