What are Observable and Measurable Terms?
In ABA, we describe behavior based on what we can see and measure, not what we think the person is feeling. This is the concept of Operational Definitions. Meaning "Subjective" terms like "He was angry" or "She was sad" are not allowed. Instead, we use "Observable" terms like "He threw the chair" or "She cried with tears."
For your RBT practice test, you will face questions asking you to pick the "best" description of a behavior. Always choose the one that describes the physical action rather than the internal emotion.
On the RBT Practice Exam, this is often tested via the "Dead Man's Test." If a dead man can do it, it is not behavior. Can a dead man "not listen"? Yes. So "not listening" is a bad definition. Can a dead man "say no"? No. So "saying no" is a valid behavior.
The 3 Criteria for a Good Definition
1. Objective: Refers only to observable characteristics (movements), not mental states.
2. Clear: Readable and unambiguous. A stranger read it and know exactly what to look for? (The Stranger Test).
3. Complete: It delineates the boundaries. What counts as an instance and what does not?
Clinical Use Cases
Imagine a behavior plan for "Aggression." If the definition is just "being mean," one RBT might count a frown as aggression, while another only counts a punch. The data would be useless garbage.
However, if the definition is: "Aggression is defined as any instance of making forceful contact with another person using an open or closed fist." Now, every RBT counts the exact same thing. This creates Inter-Observer Agreement (IOA).
Common Mistakes
Avoid mentalistic terms like: "Frustrated," "Anxious," "Happy," "Understanding," or "Knowing." You never know if someone "knows" something; you only know if they answer the question correctly.
Instead of "Frustrated," write: "Groaned, furrowed brow, and slammed pencil." Instead of "Happy," write: "Smiled and clapped hands."
RBT Practice Exam Tips for Definitions
Look for the option that sounds like a video camera recording. A camera records actions, not feelings. If the answer choice describes an emotion, it is wrong.
Pay attention to the Environment. Good descriptions often include the context. "When asked to sit, client fell to floor." This is better than just "Client fell."
Professional Communication
Using measurable terms protects you legally and ethically. Writing "The child was bad today" in a session note is unprofessional. Writing "The child engaged in 15 instances of non-compliance" is a clinical statement of fact.
This skill sets you apart as a scientist-practitioner. You don't judge clients; you observe and measure their actions to help them improve.
Practice translating your own feelings into behavioral terms. "I am hungry" becomes "I am walking to the fridge and opening the door." It is a fun mental exercise that sharpens your clinical eye.
Frequently Asked Questions About Describing Behavior
What is an Operational Definition?
It is a specific, objective description of a behavior that allows two different people to see and measure the same thing.
What is the Dead Man's Test?
A rule to determine if something is a behavior. "If a dead man can do it, it ain't behavior." Example: "Staying quiet" (Dead man can do it = Not behavior). "Speaking loudly" (Dead man can't = Behavior).
Why can't I use words like "Angry"?
Because "Angry" is subjective. My version of angry might be yelling; yours might be silence. We cannot measure "Angry," but we can measure "Yelling."
What does "Objective" mean?
It means based on observe facts (sight, sound), not on opinions, feelings, or interpretations.
What is the Stranger Test?
If a total stranger read your definition, could they walk into the room and spot the behavior accurately? If yes, it passes.
Why is this important for data?
Without clear definitions, data is unreliable. If RBTs are counting different things, the BCBA cannot trust the graph.
Is "Non-compliance" a good definition?
No, it is too vague. Better: "Failure to initiate a response to a directive within 5 seconds." That is measurable.
Can I describe "Thinking"?
No. Thinking is a private event. You can describe "Staring at the ceiling" or "Writing an answer," but you cannot measure thinking directly.
What are "Mentalisms"?
Terms that attribute behavior to unseen mental states (e.g., "He did it because he knows better"). ABA avoids these explanations.
How do I describe "Tantrum"?
Break it down: "Screaming, crying with tears, and kicking legs." Tantrum is a label; the behaviors are the specific actions.
Is this on the RBT exam?
Yes. It is a cornerstone of the measurement category. You will be asked to identify the "measurable" description from a list.
Does context matter?
Yes. Describing the Antecedent (what happened before) helps define the behavior clearly. "Screaming when denied access" is more specific than just "Screaming."