Observing Behavior Using A-B-C Data
By: Dr. Cathy Pratt, BCBA-D and Melissa Dubie, M.Ed.
All members of the student’s individualized education program (IEP) can observe
behavior to learn about patterns and functions of behavior. Everyone who observes
behavior probably looks for similar characteristics of autism spectrum disorders (e.g.,
communication challenges, social deficits, restricted area of interests, sensory
needs, etc.) and the impact on behavior. How information is gathered may be
different for each person collecting the data and depending on the complexity of the
situation. One format involves directly observing and recording situational factors
surrounding a problem behavior using an assessment tool called ABC data
collection. An ABC data form is an assessment tool used to gather information that
should evolve into a positive behavior support plan. ABC refers to:
   •     Antecedent- the events, action, or circumstances that occur before a
         behavior.
   •     Behavior- The behavior.
   •     Consequences- The action or response that follows the behavior.
The following is an example of ABC data collection. ABC is considered a direct
observation format because you have to be directly observing the behavior when it
occurs. Typically it is a format that is used when an external observer is available
who has the time and ability to observe and document behaviors during specified
periods of the day. It is time and personnel intensive. From this data, we can see that
when Joe is asked to end an activity he is enjoying (we know that he enjoys playing
computer games), he screams, refuses to leave, and ignores. We also can see that
the response to Joe’s refusal consists mostly of empty threats. If we follow Joe
throughout the day, we may find that he is asked repeatedly to follow diections. In
addition, the data reveals that Joe’s family uses threats that are not followed through.
Joe has learned that persistence, ignoring, and refusal will wear parents down.
               Antecedent                    Behavior                 Consequence
                                       Joe screams, "NO!"
       Parent asks Joe to stop                                Parent tells Joe to leave the
                                       and refuses to leave
       playing on the computer.                               computer again.
                                       the computer.
                                                            Parent starts counting to 10 as
       Parent tells Joe to leave the   Joe again refuses to
                                                            a warning to get off the
       computer.                       leave.
                                                            computer.
       Parent starts counting to 10    Joe does not move    Parent finishes counting to 10
       as a warning to get off the     from the computer    and again warns him to get off
       computer.                       station.             the computer.
       Parent finishes counting to     Joe stays at the     Parent threatens that Joe lose
       10 and again warns him to       computer and refuses computer privileges in the
       get off the computer.           to leave.            future.
Parent threatens that the Joe   Joe ignores and        The parent count to 10 again
will lose computer privileges   continues working on   and again threatens future
in the future.                  the computer.          computer use.
The parent counts to 10         Joe ignores and
                                                       The parent becomes angry and
again and again threatens       continues computer
                                                       leaves the room.
future computer use             use.