This document discusses budget and resource tracking for immunization programs in Anglophone African countries. It provides an overview of concepts like demonstrating transparency, linking investments to outputs, and empirical budgeting. The document presents examples of budget tracking tools used by countries in the Sustainable Immunization Financing program, including a generic budget flow analysis tool. It also shares examples of how resource tracking data has helped immunization programs in some countries secure fuller budget disbursements and improve expenditure reporting.