• User type (e.g. teacher or student)
• Language Preference (e.g. ESL student):
  • Benedetto, D., Caglioti, E. & Loreto, V. 2002, "Language trees and zipping". Physical Review Letters, 88, 048702. PDF and Josh Goodman's venomous response PS
  • Fuchun's classifier did 100% on the identification task
• Background Knowledge(e.g. what do students know, what are they interested in)
• skills (e.g. assessments of math skills)
• Progress (related to specific curricula)

Task-related Context

• Genre (e.g. recognize the genre of a doc, use of genre in retrieval)
• Authority (e.g. rate the quality of a web page, use of authority information in retrieval)
  • Chang, H.; Cohn, D.; and AndrewMcCallum^?, Creating Customized Authority Lists, in Proceedings of the Seventeenth International Conference of Machine Learning, 2000. HTML
• Reading / Grade Level (this actually falls under user- or setting-related context)
• Task
• Time
• Subject domain

Query-related Context (work in progress!)

• Query Type (e.g. find a location, identify a person, find a document)
• Query Quality (e.g. ambiguity, spelling)
• Session History (e.g. sequence of questions, other tools used)

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