Click modeling aims to interpret the users search click data in order to predict their clicking behavior. In this book, we propose two directions of extending existing click model works: (1) expanding query-document relevance score with a user dimension, hence personalized click models capturing user intrinsic preferences by matrix and tensor factorization; and (2) using previous click models as a micro layer for each click in a macro click chain, which includes search click logs for every clickable block on the whole search result page. Either one of our perspectives on search click modeling...