This major group comprises specialized middle management occupations in engineering, architecture, science and information systems. These occupations come with Training, Education, Experience and Responsibility (TEER) identified as TEER 0. The occupations classified under TEER 0, as those included in this group with zero (0) as the second digit of their code, are considered management occupations.

This major group comprises professional occupations in natural sciences; professional occupations in applied sciences and professional occupations in engineering. These occupations come with Training, Education, Experience and Responsibility (TEER) identified as TEER 1. Occupations classified in TEER 1, as those in this group with a 1 as the second digit of their code, typically require a university degree (bachelor's, master's or doctorate) or the accumulation of several years of experience and expertise in the subject matter knowledge in a related occupation found in TEER 2, when applicable (which includes occupations with a 2 as a second digit in their code).

This major group comprises technical occupations related to natural sciences; technical occupations related to applied sciences and engineering. These occupations come with Training, Education, Experience and Responsibility (TEER) identified as TEER 2. Occupations classified in TEER 2, as those included in this group with a 2 as the second digit of their code, typically require completion of a post-secondary education program of two to three years at community college, institute of technology or CÉGEP; or completion of an apprenticeship training program of two to five years; or supervisory or significant safety responsibilities; or the accumulation of several years of experience in a related occupation found in TEER 3, when applicable (TEER 3 includes occupations with a 3 as a second digit in their code).