What factor most determines whether an evidence-based intervention will have impact in practice?

• A. It is adopted
• B. Providers are trained to deliver it
• C. Providers choose to deliver it
• D. Eligible populations receive it

Answer: (A)

Adoption is the key gatekeeper for real-world impact. If a clinic or organization doesn’t commit to using the intervention, it won’t be delivered to patients regardless of how effective it is, how well providers are trained, or how many patients could benefit. Adoption means the setting has decided to try the intervention in practice, creating the conditions for implementation, training, and outreach to actually occur. Training and providers’ willingness are important, but they only matter once there is a deliberate choice to adopt the intervention. Delivering to the eligible population is the outcome of successful adoption and implementation, not the initial determinant of impact.