The IB Extended Essay, rather than a single-day exam, is a mandatory, year-long research project that IB students write with a faculty advisor’s guidance. The essay, which is typically at or around 4,000 words in length, falls within one of the following thematic groups: Studies in Language and Literature, Language Acquisition, Individuals and Societies, Sciences, Mathematics, or the Arts. The IB resource center contains sample essays highlighting the “diverse range of topics” students may cover.