Previous work in the area have proposed a number of methods for identifying and extracting task knowledge from search query sessions (Mehrotra and Yilmaz, 2015b;Wang et al., 2013;Lucchese et al., 2011;Verma and Yilmaz, 2014;Mehrotra and Yilmaz, 2015a).
while some tasks are fairly trivial and single-shot (e.g.