Fidelity criteria are increasingly used in program monitoring and evaluation, but are difficult to derive for emerging models (i.e., those not based on theory or a research demonstration project). We describe steps used to develop and operationalize fidelity criteria for consumer-run (CR) mental health services: articulating and operationalizing criteria based on published literature, then revising and validating the criteria through expert judgments using a modified Delphi method. Respondents rated highest those structural and process components emphasizing the value of consumerism: consumer control, consumer choices and opportunities for decision-making, voluntary participation (and the absence of coercion), and respect for members by staff.