In Nigeria, hundreds of government-hired enumerators armed with GPS-enabled smartphones have systematically been visiting schools, water points, and health facilities across the country. At each location they take a photo, record a GPS point, and with the aid of a mobile data collection form, assess local capacity based on the availability of necessary human and material resources—such as basic infrastructure, staffing, furniture, and tools—to deliver a given service. For example, is a water point functional and being used? Does a clinic have adequate equipment, medicines, and staffing to deliver care? Does a school have a roof, teachers, desks, and books?