”I took this photo in May 2016, while on a monitoring visit in a rural area near Choma, Zambia”, tells photographer Daniel B Williams. He goes on, “The survey fieldwork teams were working late into the evening to complete interviews, and biomarker testing/counseling in this rural household. This was an area without electricity, so the teams had to work by the headlights of the survey vehicle.” The PHIA Project (Population-based HIV Impact Assessments) is a multi-country initiative to measure the reach, and impact of HIV programs in PEPFAR-supported countries, and guide policy and funding priorities. The survey, referred to as ZAMPHIA, is the first in Zambia to measure national HIV incidence, pediatric HIV prevalence, and viral load suppression. The results provide information on national and subnational progress toward control of the HIV epidemic.