Based upon the structure of Canadian Classification and Dictionary of Occupations, the volume presents highly condensed descriptions of classification clusters representing the universe of occupational groups in the Canadian economy. It is a useful tool for vocational counselors, students, and clients. Each cluster is assigned a number; the clusters are then listed in numerical order. An alphabetical index of clusters provides a second access route. The information provided for each of the approximately 350 clusters is presented in six sections. The Work Performed Section includes a lead statement and an explanation of the work functions and activities performed in the cluster. The Aptitudes and Capacities Section develops the aptitude ratings and capacity ratings (physical activities and environmental conditions) presented in the Qualifications Profile Section. In that section, aptitude, temperament, and interest factors are considered. The Training and Entry Requirements Section alerts people to special cluster requirements. The Advancement and Transfer Possibilities Section provides examples for the occupations, not necessarily for an individual. Finally, the arrangement of occupations within a cluster is listed in the List of Occupational Titles Section. (AG)