This discovered potential could leverage a new generation of navigation tools in search and information retrieval. One of the primary bottlenecks in information retrieval tasks is that users can only access content of a retrieved item serially and sequentially. This not only applies to processing multiple materials, but also, importantly, to filtering lengthy ones, since users may not know at the outset which parts of the content (e.g. a video) might be relevant to their needs. To this end, ‘content previews’ could improve the speed and/or accuracy of user relevance judgements across a variety of content types and information retrieval tasks (Tombros and Sanderson, 1998). However, much of the potential to build better navigation tools still appears to be unused in search and retrieval tools. Analyses of how these tools affect user behaviour, perception and search experience are also scarce. Written documents, such as ebooks, academic papers and lecture notes, constitute a substantial fraction of educational resources. 




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