Between 2013 and 2018, BID designed, developed, and introduced an electronic immunization registry in three regions in Tanzania and one province in Zambia. The Initiative’s financial records were used to account for the financial costs of designing and developing the EIRs, BID staff time, expenditures for rolling out the EIR systems and the related suite of interventions to health facilities, and recurrent costs. Total financial costs, cost per facility and cost per child were calculated in 2018 US$. By documenting the costs associated with introducing an EIR, BID hopes to help other countries introduce more affordable platforms for their own health landscapes. Read the full article in BMJ Global Health.