Discrete-Trials Teaching (DTT) is one of the procedures that behavior analysts use to teach someone. During a teaching trial in DTT, the teacher presents the antecedent(s), waits for – or helps – the student to respond, and then provides an immediate consequence. The teacher repeats these steps many times in fairly rapid succession during a teaching session. One important characteristic of this procedure is that the opportunity for the student to respond depends on the teacher’s presentation of the antecedent(s). Thus, with this procedure, the rate at which a student can respond depends on the rate at which the teacher presents antecedents. Children with autism participating in an intensive ABA training program commonly receive several hours of DTT per day.