Ilya Markov was invited to give a tutorial on user behavior in web search at the AINL-ISMW FRUCT 2015 conference for young scientists, held in St. Petersburg, Russia, on November 9-14. The tutorial discussed how user clicks in web search can be analyzed, interpreted and modeled and how the resulting click models help to improve web search. The information and materials on click models can be found at the dedicated web site.