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One of the difficulties with longitudinal data files has been to find a way to produce public-use microdata files that contain sufficient detail for researchers, while safeguarding the privacy of respondents. Where PUMF (Public Use Microdata File) are freely available to institutions and individuals,听micro-data available in the QICSS laboratory are finer and allows for deeper analysis, while still protecting respondents' privacy.听Micro-data also offers much more detailed geographical information, for example, the census' publicly available files give information about 33 metropolitan areas (~ 100,000 individuals) whereas the files available in our laboratory offers information on 54,000 dissemination areas (~400-700 individuals).听