The IMDB holds information about immigrants who became Permanent Residents (PR) of Canada from 1980 onward. Information included in the landing records (Immigrant Landing File, or ILF) is linked with the tax files (T1 Family Files) in subsequent years after arrival (starting in 1982) as well as the Non-Permanent Resident Files (NRF). Combining the information from these administrative records, the IMDB provides detailed socioeconomic and demographic information about immigrants at the time of landing and afterwards. It also allows us to draw upon some information about the pre-landing histories of migrants using temporary permits and economic activities after arrival.