The same writer has written the last two papers on a virus outbreak.
This paper is to develop a lesson plan to teach a class on what was learned from the last two papers on virus outbreak.

For example, you can put together a “lecture” that can be made into a powerpoint to teach other students about your findings in the first two milestones. You could design an exercise to test out a concept. When I did these myself, I would often develop a lesson plan. A successful Milestone III meets the following criteria:
It is informed by theory and/or current research findings.
It is a practical project that deals with a concrete situation
It is oriented towards improving the issue/problem identified.