There is broad agreement on what must be included in a package of key, low-cost interventions – from vaccines and medicines to family planning and micronutrients – that can mean the difference between life and death for many vulnerable women and children. In order to deliver this essential package of interventions and ensure that countries are able to sustain their efforts over the longer term, scaled-up investment in health systems is also critical. Strong health systems require sustained investment over time. In many countries, there remains a large funding gap that must be filled in order to reach women and.