This category contains supervisory, production and labouring occupations in manufacturing, processing and utilities. Occupations in this category are characterized by either technical training or internal progression, and on-the-job training. Process control occupations in this category are increasingly technical and post-secondary training is usually required. For many occupations in this category, workers typically start out as labourers and progress to machine operation occupations through experience. Progression to supervisory positions requires experience in the occupations supervised. Mobility in some of these occupations may be limited by seniority provisions of collective agreements, or may require additional training.