Thus, year 1 to year 6 changes in wages and earnings can be compared between those who did not attend school in the 6-year period and those who attended at some point between years 2 and 5. Schooling participants can be further classified between those who received a post-secondary certificate and those who did not.1 We select workers who responded to the surveys in each year (95% of respondents). [...] To eliminate those who had not yet entered the labour market and those who were approaching retirement, we include only persons between the ages of 17 and 59 in the first year of observation. [...] We also examine marital status: at the end of the first year of observation, 73% of men and 70% of women were married; 21% of men and 19% of women were single (never married). [...] Among the remaining workers, 15% of men and 14% of women had a bachelor or higher degree; 45% of men and 48% of women had an education above high school but below the bachelor level. [...] Initial level of education is another factor: workers with less than a high school education were least likely to participate in adult schooling and to obtain a post-secondary certificate; workers with a college-level education were most likely to participate and to obtain a certificate.