Intervention fidelity is the extent that intervention occurs as intended. Fidelity in clinical practice presents a unique challenge. Interventions are complex, involving multiple components that are difficult to standardize. Interventions often rely on individuals to carry out treatment in the natural environment (home/community). Fidelity needs to be considered through two lenses: delivery of the intervention by therapist; and individuals enacting (carrying out) intervention with their child in the natural environment. This session is for researchers and clinicians who are interested in understanding intervention fidelity as a means to better understand therapy outcomes. Attendees will learn about dimensions of fidelity. Examples of tools used for measuring fidelity in a variety of settings and across a variety of dimensions will be provided to assist attendees with applying this content to their area of practice and research. Small working groups will develop plans for measuring fidelity relevant to their own setting, considering opportunities, resource needs, and challenges. Attendees will benefit from a large-group discussion of the plans developed within their small working groups in order to leave the session with a product that will guide them in next steps in their clinical practice or research.