Mandl, ThomasFreytag, Johann-ChristophRuf, ThomasLehner, WolfgangVossen, Gottfried2019-02-202019-02-202009978-3-88579-238-3https://dl.gi.de/handle/20.500.12116/20439The evaluation of information retrieval systems involves the creation of potential user needs for which systems try to find relevant documents. The difficulty of these topics differs greatly and final scores for systems are typically based on the mean aveenText/Conference Paper1617-5468