There are two types of policy briefs: an advocacy brief (arguing for a course of action) and an objective brief (provides an informative overview on an issue). Policy briefs are created to provide brief evidence-based overviews and convincing information that urge the reader to make a decision on a particular issue. Use these links to locate policy briefs and policy-related reports. For a guide on how to write your own policy brief refer to this document link, Writing Effective Reports, offered by the Food and Agriculture Organization.
Be sure to read the think tank's mission and objectives; they may have certain biases or goals.