135 minute training video. 1-week (7 days) Access. Discrete Trial Teaching is an intervention method of applied behavioral analysis. It teaches skills through a structured ladder of small, easily-taught components. DTT is a teaching strategy that breaks down skills into small, “discrete” components. Systematically, a parent can teach these small skills one by one. Parents learn to use tangible reinforcements for desired behavior. For a child, this might include a candy or small toy.