Overview of NTCIR-11

This is an overview of NTCIR-11, the eleventh sesquiannual workshop for the evaluation of Information Access technologies. NTCIR-11 presents the most diverse set of evaluation tasks in the history of NTCIR, led by over 40 cutting-edge researchers worldwide. This paper presents a brief history of NTCIR and overall statistics of NTCIR-11, followed by an introduction of nine evaluation tasks. We conclude the paper by discussing the future directions of NTCIR. Readers should refer to individual task overview papers for their activities and findings.