The document outlines 10 steps for developing and implementing a social host ordinance to address underage drinking: 1) develop a policy statement, 2) engage enforcement, 3) collect data, 4) make the case, 5) draft policy language, 6) use media advocacy, 7) mobilize support, 8) get the policy adopted, 9) ensure enforcement, and 10) evaluate effectiveness. It provides guidance and examples for each step, including developing a power analysis, framing the issue for media and decision-makers, and ensuring community support throughout the process.