A study analyzed the schooling, further adult course participation, and informal learning of organized and unorganized workers in different occupational classes across Canada. Data were obtained from the first Canadian national survey of 1,562 adults' informal learning practices, conducted in 1998, and field notes and interview transcripts drawn from participants in the auto plant case study of the Working Class Learning Strategies project conducted at five union locals in southern Ontario in 1995-2000. The study found that unionized and non-unionized industrial and service workers in Canada are increasingly highly educated, increasingly participating in adult education courses and devoting substantial amounts of their time to informal learning activities outside organized education and training programs. In addition, the study found that working people are generally engaged collectively and individually in an extensive array of employment-related and other informal learning activities that are neither fully recognized by most employers or union leaders nor given prior learning credit by educational institutions. The study concluded that underestimation of the current range and depth of workers' knowledge and skills by union leaders represents a significant barrier to further growth of the labor movement. Recommendations for strategies to facilitate union growth are suggested, based on what has worked most effectively in these locals of differing general organizational strength and demographic profiles. (KC)