| 237 | -- | 242 | Hiroshi Nakagawa, Tatsunori Mori, Noriko Kando. Preface to the special issues on NTCIR-4 |
| 243 | -- | 262 | Tsuneaki Kato, Jun-ichi Fukumoto, Fumito Masui, Noriko Kando. Are open-domain question answering technologies useful for information access dialogues?---an empirical study and a proposal of a novel challenge |
| 263 | -- | 279 | Hideki Isozaki. An analysis of a high-performance japanese question answering system |
| 280 | -- | 304 | Tatsunori Mori. Japanese question-answering system using A* search and its improvement |
| 305 | -- | 320 | Tatsunori Mori, Masanori Nozawa, Yoshiaki Asada. Multi-answer-focused multi-document summarization using a question-answering engine |
| 321 | -- | 339 | Naoaki Okazaki, Yutaka Matsuo, Mitsuru Ishizuka. Improving chronological ordering of sentences extracted from multiple newspaper articles |
| 340 | -- | 356 | Masaharu Yoshioka, Makoto Haraguchi. On a combination of probabilistic and boolean ir models for WWW document retrieval |
| 357 | -- | 374 | Lingpeng Yang, Dong-Hong Ji, Li Tang, Zheng-Yu Niu. Chinese information retrieval based on terms and relevant terms |