This document discusses leveraging mobile technology to strengthen the work of community health workers. It describes CommCare, a mobile app that community health workers can use to document questions and answers, transmit data, and use multimedia and logic to guide processes. The document outlines several Pathfinder projects using CommCare in Tanzania, Nigeria, and Kenya focused on areas like HIV/AIDS, family planning, antenatal care, and maternal and child health. It discusses the design and implementation process, including identifying challenges, designing with end users, field testing, and iterations. It also covers supervision, monitoring, evaluation, challenges encountered, and lessons learned around technology familiarity, reporting burdens, and using data to improve quality of care.