There is a type of technology that looks for the context of search called Semantic search.
As a relative pronoun, that introduces restrictive clauses, such as in "the different factors that are fundamental and specific to particular features"; in a study of medical science journals in Britain leading up to 2004, it was found that that had been largely replaced by the word which when used in this context, while writing that is increasingly formalranging from verse to fiction to nonfictionfinds that usage decreasing as wh- words (interrogatives) relatively increase
 Depending on the task and the individual's sense of time urgency and control, it can lead to poor results when there are complex decisions to be made

