A misleading title, or did the document teach you something?! Of course, it is also possible that while a quick scan of a title might make a document seem relevant, users might decide after reading its full text that it is not. I will argue later that this test is too hard (like deciding whether you want to buy a bottle of wine after you’ve drunk it!), but here we will simply note that how well correlated relevance feedback for proxies is with that for full documents is an interesting, empirically testable question.