6. Economic evaluation
There're a limited number of economic evaluation designs.
These are detailed on the Systematic Outcomes Analysis site.
The screenshot shows the two economic analysis designs you're going to try to do in this case.
You can find more information about these economic evaluation designs at the Systematic Outcomes Analysis site. If you don't know a lot about economic evaluation you should involve someone who does in this part of your plan.
Just show them your Easy Outcomes work so far and get them to help you write this section of your plan.