RE-AIM framework includes five dimensions: Reach, Effectiveness, Adoption, Implementation, and Maintenance. Which of the following is a RE-AIM dimension?

• A. Adoption
• B. Maintenance
• C. Implementation
• D. Reach

Answer: (D)

In RE-AIM, the idea is to look at how a program works in real-world settings by examining different aspects of its reach and impact. Reach specifically measures the extent to which the target population participates in the intervention, focusing on both how many enroll and who those participants are to assess representativeness and accessibility. For example, in a clinic-based weight-loss program, Reach would tell you what share of eligible patients actually join and whether participants resemble the broader patient population. The other options describe other dimensions: Adoption looks at the settings or staff that decide to use the program; Implementation concerns how faithfully the program is delivered in practice; and Maintenance addresses whether the program continues and whether effects persist over time. Since the question asks for a dimension that fits within RE-AIM, Reach is the correct one.