An advocacy brief includes a concise summary of a particular issue, the policy options to deal with it, and some recommendations on the best option. It also provides decisionmakers with the evidence to support that option. 
WHGI Publications & Resources
AFP Advocacy Porfolio: Implement a Plan (Part 2)
Publication Year: 2015
Link to File: https://bmgi.wpengine.com/wp-content/uploads/files_live/3%20Implement%20a%20Plan%20%28Part%202%29_0.pdf