This diagram displays the conceptual framework for in-depth country case studies. The page is split in two rows, with a smaller row labeled ‘Drivers’ on top and a larger row labeled ‘Immunization System’ on the bottom. In the Drivers row there are four separate boxes. From left to right, the first box is labeled ‘Drivers’ and describes intervening to determine how inputs manifest. This leads to a box within the immunization system row that identifies inputs as finances, human resources, and stakeholders. A second box in the Drivers row represents intervening to translate inputs into essential routine immunization (RI) components. This box leads to a box in the Immunization System row. Within this box, cold chain, vaccines, and service delivery (including facilities, points, and strategy), are identified as ‘Immunization System Essential Components.’ The third box in the Drivers row represents intervening to boost implementation. This box leads to another, in the lower row, that identifies vaccine quality, stockouts, access, and service quality as implementation process. The final box in the Drivers row represents intervening to translate implementation into effective RI system performance. This leads to a box in the lower row that identifies DTP1 coverage, DPT3 coverage, dropout, and equity as factors of immunization system performance.