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*A: The full ClueWeb09 collection consists of roughly 1 billion web pages
*B: There is a smaller amount of documents from Feb. 2003 to May 2004 and there is no data from June 2004.

1: For the details of the task data (topics and relevance judgments, questions and answers, summaries, etc), please visit the webpages of each task.

2: For the data with **, the procedure to obtain the data is specified.
**a: The data will be delivered from LDC for the Workshop participants who submit an additional user agreement form to LDC.

**b: The data will be distributed by Sogou labs for research purpose only. License information is available at the page:
http://www.sogou.com/labs/dl/license.html (in Chinese).

**c: The data will be distributed by Carnegie Mellon University for research purpose only. A license agreement can be found on the page:
http://boston.lti.cs.cmu.edu/Data/clueweb09/.

**d: The data can be provided by the National Institute for Japanese Language for research purpose for a charge. A license agreement can be found on the page: http://www.kokken.go.jp/katsudo/seika/corpus/releaseinfo/020/ (in Japanese)

**e: The data will be delivered from The Hong Kong Institute of Education (HKIED) for the Workshop participants who submit an additional user agreement form to HKIED.
http://research.nii.ac.jp/ntcir/ntcir-9/ntcir9cepc-patmt.html

3: Please notice that the document collections shall be used for the purpose of accomplishing tasks set out in the NTCIR Workshop and for the purpose of research related to the tasks. The documents can not be used for "information purpose".

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