Three Term Contingency Model


The antecedent is what comes before the behavior. More specifically, it is the environmental conditions or stimulus changes that exist or occur prior to the behavior of interest.

For example, a student throws a temper tantrum during transition into math. The antecedent would be what triggered the student to throw the temper tantrum, which in this case would be the announcement to transition into math.


The behavior is the observable response that occurs.

The behavior in this case would be that the student throws a temper tantrum.


Consequence is a stimulus change that follows a behavior of interest.

The consequence is that the student does not have to participate in math because he is busy throwing a temper tantrum.

The goal of the ABCs is to identify each component and reflect on what you as the teacher could do differently so that the consequence turns out differently.