This document summarizes a study on the impact of hygiene training and promotion in Kibera, an urban slum in Nairobi, Kenya. The study found that providing access to water, sanitation facilities, and hygiene education and training, along with promoting hygiene-related entrepreneurship, led to significant improvements in health outcomes and facility usage. Key outcomes included reductions in reported diarrhea rates and missed work days, as well as increases in proper handwashing techniques and water purification practices. Linking hygiene promotion to small business opportunities helped sustain improved hygiene behaviors over time.