The National Bureau of Statistics (NBS) is not the only producer of statistics in the National Statistical System in the country. However, according to the Statistics Act, 2002 NBS is mandated among other tasks to coordinate statistical services in the country so as to produce quality statistics that are comparable over time and across subject matter areas.

 Experience has shown that producers of statistics in Tanzania have been producing statistics that are conflicting. This situation has, over the years, brought difficulties for planners and decision makers to decide on which dataset to use.

 In order to address this situation, the NBS has produced this document, which provides statistical concepts and definitions to be used by all producers and users of statistics so as to enhance harmonization in the production of official statistics in Tanzania.

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