We worked with Ona in 2017-2018 on an electronic immunization registry as part of the Better Immunization Data (BID) Initiative work with the government of Zambia, using the OpenSRP platform. Ona was an excellent partner as we refined the system requirements and worked under a tight timeline to meet the government’s vision and our grant objectives. Through our partnership, the Zambia Electronic Immunization Registry (ZEIR) was developed and deployed to over 300 facilities in Southern Province. The Ona team was critical in thinking through all facets of the work, from the system itself but also ensuring the user perspective was constantly integrated and that issues of sustainability were considered. We continue to collaborate with Ona in a variety of areas.