Using Web Search Engines (WSEs) to search on the web is considered to be an easy process by many web searchers; meanwhile, most of them are left frustrated in an attempt to satisfy their information needs, even after modifying their search queries and/or using the search filters provided by WSEs. Whichever strategy they use, they are still often challenged by the following questions: How can I create a more precise search query? How do I know whether using a given search filter drives me towards or away from my search goals? How do I gain search experience by using these filters? ...