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The Data for Demographic Development case studies examined the demand for data in four sub-Saharan African countries. The project focused on the views of policymakers, the data they use, the data they want but do not receive, and what they might use but do not request. The underutilization of existing data was explored as was factors that limit the collection, use, and sharing of data. Case studies explored how access to data might be improved. The project’s objective was to create an intimate portrait of access and demand at the country level, thereby complementing the wide array of international initiatives underway. Although the emphasis was on demographic data, the project covered the range of data that are fundamental to developing and assessing policies in the areas of education, health, environment, income, employment, and other measures of development. As explained in this overview report, these case studies explored censuses, surveys, and both budget and service use statistics to determine whether policymakers are getting the data they need to develop sound policies.