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all right now its time for us to talk about evaluation of search engines this is actually one of the biggest topics that were going to cover in the course um well i think one of the things that i want to really mention about it is uh you might go oh why would i ever need to this is so niche how to evaluate a search engine i think the the big thing here is um its its gives us a perspective on how do you evaluate a complex information system yes its an information retrieval system but its a complex information system and youre going to have the potential to be part of and build lots of different information systems in your life if you go into software or management engineering or anything like that so often the determining whether or not that information system uh improves over an existing system is actually quite a complex uh thing because we actually need to be concerned with usually the people who are using it the tasks theyre trying to solve and are they able to solve their