| Relevance feedback |
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| ¢ | Koenenmann and
Belkin (96) checked whether |
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| relevance
feedback helped users |
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| ¢ | Control: no RF |
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| ¢ | Opaque: saw new
documents |
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| ¢ | Transparent: can
see modifications |
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| ¢ | Penetrable:
__________________________ |
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| ¢ | Possible
conclusion: ______________________ |
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