The ECCD1 field has neglected the critically important topic of early childhood investment, finance, and costs. This issue of the Coordinators' Notebook, prepared by the Consultative Group'sWorking Group for Early Childhood Investment, Financing, and Costing, begins to address this gap in ECCD studies. We hope this issue will spark an international dialogue about how toexpand investment in early childhood services and improve ECCD costing and financial planning.