The overall project goals are to increase the pipeline of early-career Nigerian-based investigators and practitioners who can lead Implementation Science (IS) research for equitable cancer control in Nigeria. We will use participatory implementation science approaches (such as crowdsourcing and apprenticeships) to develop sustained capacity for implementation research at the Nigerian Institute of Medical Research. In this capacity building core, we propose a series of in-person and online training opportunities in IS methods to spur innovative, equitable cancer control research pilot studies. Each year, open calls will be used to identify eight exceptional trainees (four two-person teams,each with one researcher and one practitioner) from participating Nigerian-based institutions (including academic, clinical, and community-based organizations). Each cohort will join a two-week residential training experience focused on IS for equitable cancer control: one week of virtual training and one week of in-person training at NIMR. Trainees will also become part of a yearlong virtual learning community and mentoring program designed