In ADAPT, a Data Source refers to a specific dataset, metadata set, and database or metadata repository, from which data or metadata are available for various indicators. An example would be the dataset from a specific instance of a regularly conducted Demographic and Health Surveys (DHS), which are nationally representative household surveys typically conducted about every 5 years in many countries. The start and end date for a specific data source in this case would refer to the time period to which, the statistical results derived therefrom refer to.