Imagine that you have been called upon to explain Medicare Part D coverage at an informational brown-bag luncheon at a local senior center. The director of the center tells you that the presentation should summarize Medicare Part D coverage because many of the people who use the center don't really understand why Medicare Part D was created. She also wants you to explain the pros and cons of Part D, including what is known as the "doughnut hole."
You decide that you also want the audience to understand that like any policy or public health program, Medicare Part D has implications for the public health system, so you include that as part of your presentation.