- Skill - defined as the ability to carry out the tasks of a given job
- Job - defined as a set of tasks and duties carried out, or meant to be carried out, by one person for a particular employer, including self-employment.
- Skill level - used in classifying occupations at the highest level or the major group level and measured operationally by considering one or more of:
- Skill specialization - used in classifying occupations in sub-major groups, minor groups and unit groups and considered in terms of four (4) concepts:
- 10 major groups (one-digit code) - the highest level of occupation aggregate and represent broad fields of work
- 43 sub-major groups (two-digit code) - represent the second level of aggregation
- 130 minor groups (three-digit code) - represent the third level of occupation aggregate
- 436 unit groups (four-digit code) - represent the fourth level of occupational groupings.
- Changes/improvements in concept:
- To align with the 2008 ISCO, Group 0 in the 1992 PSOC no longer pertains to "Special Occupation" but is now referred to as "Armed Forces" in the 2012 PSOC to consist of military occupations only. Each major group in the 2012 PSOC now includes the category, "not elsewhere classified" to account for workers whose occupation cannot be identified/classified, and new workers seeking employment which previously fall under Group 0 – Special Occupations along with armed forces in the 1998 PSOC.
- Deleted "supervisors" occupation from Group 1 since other types of supervisors also exist in other major occupational groups. Moreover, in the 2008 ISCO, "supervisors" are not considered managers since they do not have budgeting and other important decision-making functions. With these modifications, "supervisors" categories in Group 1 are now distributed in relevant major occupational groups where their skills belong or are related.
- A distinction is now made between "market oriented" and "subsistence" agriculture, forestry and fishery workers under Major Group 6.
- Cashiers and ticket clerks, formerly under Group 4 (Clerks) in 1992 PSOC, were transferred to Group 5 (Sales and Service Workers) because these are sales related occupations.
- Some occupations involving use of equipment/tools that were formerly classified under Group 7 and 8 but which require more advanced skills/ education or extensive training are now part of Group 3 (Technicians).
- Changes in the broad structure to highlight new or emerging occupations:
- Sub-major Occupational Group 13 - General managers and managing proprietorships in the 1992 PSOC was split into two (2) sub-major groups namely:
Sub-major group 13 - Production and specialized services managers and
Sub-major group 14 - Hospitality, retail and other services managers. This sub- major group further provides a separate code for minor group 141- hotel and restaurant managers which was not highlighted before in the 1992 PSOC.
- Sub-major Occupational Group 21 - Physical, mathematical and engineering science professionals in the 1992 PSOC was split into two sub-major groups:
Sub-major group 21 - Science and engineering professionals
Sub-major group 25 - Information and communications technology (ICT) professionals
- A separate code for Sub-major group 26 - Legal, social and cultural professionals was also created. This new sub-major group is part of sub-major group 24 - Other professionals in the 1992 PSOC.
- A new sub-major occupational group and new unit groups were created in the 2012 PSOC for the "green " or environment-friendly occupations not found in the 1992 PSOC. These include:
- Sub-major Occupational Group 41- Office clerks in the 1992 PSOC was split into three sub-major groups in the 2012 PSOC namely:
- Sub-major Group 51- Personal and protective services workers in the 1992 PSOC was split into three (3) sub-major groups in the 2012 PSOC:
- New separate codes for sub-major group were created in major group 9:
|Group||1992 PSOC||2012 PSOC|
|2012 PSOC||1992 PSOC|
|Major Group||Descriptions||No. of Sub-Major Group||No. of Minor Group||No. of Unit Group||Major Group||Descriptions||No. of Sub-Major Group||No. of Minor Group||No. of Unit Group|
|1||Managers||4||11||31||1||Officials of government and special-interest organizations, corporate executives, managers, managing proprietors and supervisors||4||13||47|
|3||Technicians and associate professionals||5||20||84||3||Technicians and associate professionals||4||18||67|
|4||Clerical support workers||4||8||29||4||Clerks||2||7||23|
|5||Service and sales workers||4||13||40||5||Service workers and shop and market sales workers||2||9||23|
|6||Skilled agricultural, forestry and fishery workers||3||9||18||6||Farmers, forestry workers and fishermen||5||16||36|
|7||Craft and related trades workers||5||14||66||7||Trades and related workers||4||16||71|
|8||Plant and machine operators and assemblers||3||14||40||8||Plant and machine operators and assemblers||3||19||66|
|9||Elementary occupations||6||11||33||9||Laborers and unskilled workers||3||10||25|
|0||Armed forces occupations||3||3||3||0||Special occupations||2||6||12|
- A Summary of Major, Sub-Major, Minor and Unit Group Titles which enumerates all the ten major groups and their respective sub-major groups, minor groups and unit groups.
- A Detailed Classification of the 2012 PSOC which represents the hierarchy of occupational groupings and their definitions, with corresponding 1992 PSOC Code and 2008 ISCO Code.
- An Alphabetic Index which lists specific occupations in alphabetical sequence with corresponding codes of the unit group where they belong.