Evaluation Measures easuring user happiness Issue: who is the user we are trying to make happy? Depends on the setting Web engine User finds what they want and return to the engine Can measure rate of return users a User completes their task -search as a means, not end SeeRussellhttp://dmrussellgooglepages.com/jcdl-talk- June-2007-short. pdf e Commerce site: user finds what they want and buy Is it the end-user, or the e Commerce site, whose happiness we measure? Measure time to purchase, or fraction of searchers who become buyers?Evaluation 6 Measuring user happiness ▪ Issue: who is the user we are trying to make happy? ▪ Depends on the setting ▪ Web engine: ▪ User finds what they want and return to the engine ▪ Can measure rate of return users ▪ User completes their task – search as a means, not end ▪ See Russell http://dmrussell.googlepages.com/JCDL-talk￾June-2007-short.pdf ▪ eCommerce site: user finds what they want and buy ▪ Is it the end-user, or the eCommerce site, whose happiness we measure? ▪ Measure time to purchase, or fraction of searchers who become buyers? Measures