Based on the principles of applied behavior analysis (ABA), discrete trial training (DTT) is used to develop a new response to a stimulus. DTT is based upon the principle of breaking down behavior into discrete steps called a "single teaching unit" or learning trials. Trials are repeated several times with the learner receiving reinforcement for responding correctly. This evidence-based practice (EBP) overview on DTT includes the following packet components: (1) Overview; (2) Evidence-base; (3) Step-by-Step Guide; (4) Implementation Checklist; (5) Data Collection Sheets; (6) Tip Sheet for Professionals; (7) Parent Guide; (8) Additional Resources; (9) CEC Standards; and (10) Module References. [This brief was co-written by the Autism Focused Intervention Resources and Modules (AFIRM) team.]