Derived from applied behavior analysis, antecedent-based interventions (ABI) are used to address both interfering behaviors (e.g. repetitive, disruptive) and on-task behaviors (e.g. engaged or working on specific task/activity) behaviors. ABI is commonly used with other evidence-based practices such as functional behavior assessment (FBA), extinction (EXT), and reinforcement (R+). With ABI, teachers and practitioners focus on identifying the events that take place immediately "before" and "after" an identified interfering behavior. The identification of both before and after events, allows for teachers and practitioners to identify the conditions or events within the environment that prompt the learner to exhibit the identified behavior (i.e., antecedents) and the conditions or events that are reinforcing the behavior after it occurs (i.e., consequences). This evidence-based practice (EBP) overview on ABI 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.]