Updating article for WikiEdu Course edit

Hi all, I'm editing this article for a WikiEdu course I'm and my main goal is to reduce some of the confusion on the policy advocacy definition as well as provide clear examples of what policy advocacy looks like at different levels of government. I want to keep the scientific focus but I think some extra background info could be useful to make the topic clearer to a wider audience. I am thinking of adding different subheadings for the page to help organize these topics.