Although significant progress has been made in the identification of youth evidence-based practices, the adoption of these interventions into community-based mental health care remains limited. Dissemination and implementation (DI) research has the potential to bridge this science-practice gap in clinical psychology. The theory of planned behavior (TPB) offers a useful conceptualization of individual behavior change including behavioral intention as defined by attitudes, subjective norms, and perceived behavioral control. To facilitate application of this model to DI efforts, the current study explores perspectives about using evidence-based practice from stakeholders in the field of youth mental health (including clinical supervisors, case managers, administrators at the departments of health and education, and direct service providers in clinic-based, school-based, and intensive in-home settings) within the TPB framework. A set of instrument items was created from this rich qualitative data using a rigorous mixed-method content validation approach. Instrument items are provided for future use in DI research.