Discrete trial teaching is a method based on the principle of breaking the behavior down into small steps that have a clear beginning, middle, and end. Trials are often repeated several times and the child is rewarded for answering correctly.DTT is just one method within the umbrella of ABA to impact behavior. Discrete trial teaching uses basic principles of ABA and incorporates them into a specific teaching method Teaching sessions involve repeated ‘trials’ with each trial having a distinct beginning and end (hence ‘discrete’).