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NTCIR-15 Data Search is a shared task on ad-hoc retrieval for governmental statistical data. The first round of Data Search focuses on the retrieval of a statistical data collection published by the Japanese government (e-Stat), and one published by the US government (Data. gov). This paper introduces the task definition, test collection, and evaluation methodology of NTCIR-15 Data Search. This round of Data Search attracted six research groups, from which we received 17 submissions for the Japanese subtask, and 37 submissions for the English subtask. The evaluation results of these runs are presented and discussed in this paper.