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Issue: who is the user we are trying to make happy?
Depends on the setting
User finds what s/he wants and returns to the engine
Can measure rate of return users
User completes task – search as a means, not end
See Russell http://dmrussell.googlepages.com/JCDL-talk-June-2007-short.pdf
eCommerce site: user finds what s/he wants and buys
Is it the end-user, or the eCommerce site, whose happiness we measure?
Measure time to purchase, or fraction of searchers who become buyers?
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