“…Large part of personal assistance applications are related to handling textual data, example tasks include news story classification [74,4], or document categorization [49,59]. In web search, detecting changes in user satisfaction has been [67,16,9] library, media search [35,22] customer segmentation customer segmentation, [14,5,47,66] profiling Marketing recommender systems movie recommendations [45,18] Management project management software project mgmt. [20] archiving article, mail organization [76,43] recognized to be important [42].…”