I would include (5) the presentation of search results - document snippets or surrogates and affordances for query refinement like faceting. One salient acronym

I would include (5) the presentation of search results - document snippets or surrogates and affordances for query refinement like faceting. One salient acronym is SERP, for search engine results page. A different "information retrieval" perspective overall would be to take a deep dive into the career of Susan Dumais, http://susandumais.com/ http://susandumais.com/