This paper extends the study of Lanoie (1992a), on the global effectiveness of preventive policies and other intervention (compensation and experience rating) adopted by CSST in reducing the frequency and severity of workplace accidents in Quebec. By extending the previous sample of 1983-87 to 1983-90, by adding the permanent disabilities as a new dependent variable, and by re-estimating the same relations in risky industries only, this study shows that, at best, certain preventive measures adopted by the CSST led to a minor reduction in the frequency of accidents during this period. The0501n results of this research are the increasing impact, in comparison with 1987, of intervention measures (compensation and experience rating) of CSST on the frequency and severity of accidents in all industries, the more pronounced effect of inspections on the frequency of accidents in risky sectors, and the mediocre performance of CSST measures in preventing accidents with permanent disabilities.