Global Scaling Up Handwashing is a Water and Sanitation Program (WSP) project focused on learning how to apply innovative promotional approaches to behavior change to generate widespread and sustained improvements in handwashing with soap at scale among women of reproductive age (ages 15-49) and primary school-aged children (ages 5-9). The project is being implemented by local and national governments with technical support from WSP. For more information, please visit . This Working Paper is one in a series of knowledge products designed to showcase project fi ndings, assessments, and lessons learned in the Global Scaling Up Handwashing Project. This.