This document describes End Violence Against Women International (EVAWI), which created the "Start by Believing" public awareness campaign. The campaign aims to educate the public and professionals on providing supportive responses to disclosures of sexual assault. Research shows negative social reactions can retraumatize victims, while positive support from friends and professionals benefits recovery. The campaign provides materials to launch local initiatives and increase reporting. Preliminary evidence suggests it may be increasing reports and demand for victim services. The goal is to better prepare communities to support victims from initial disclosure.