[en] This report summarizes the status of Atomic Energy of Canada Ltd.'s health study of its present and past employees, and is a description of the steps which have been taken up to the time of writing. During the design phase there was a shift in the emphasis of the study. What was originally proposed as a study of mortality in a population of radiation workers, related spacifically to radiation exposure, has become a study of mortality data for all AECL employees. The interest in mortality as a function of occupational radiation expksure remains, but it is recognized that the data available to the study will probably be inadequate for the definition of a dose-effect relationship, although it will be useful in conjuction with other similar studies. The importance of cancer incidence is recognized, and the possibility of linking the AECL data to that contained in the National Cancer Incidence Reporting System is being pursued