Occupational skill level experimental (OSCA 2024) (OCSK24P)

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Census of Population and Housing: Census dictionary
Reference period
2021
Released
15/10/2021

Definition

This variable describes the skill level of a person's occupation. Level one is the highest level of skill and level five is the lowest level of skill. The skill level is determined from the characteristics of the person's occupation (OCC24P), rather than the skill level of the person themselves. 

This variable has been coded using the Occupation Standard Classification for Australia (OSCA) 2024 v1.0. 

Scope

Employed persons aged 15 years and over 

Categories

Code Category 
1 Skill level one 
2 Skill level two 
3 Skill level three 
4 Skill level four 
5 Skill level five 
9 Skill level not determined 
& Not stated 
@ Not applicable 
V Overseas visitors 

Number of categories: 9  

Not applicable (@) category comprises: 

  • unemployed persons 
  • persons not in the labour force 
  • persons with labour force status (LFSP) not stated  
  • persons aged under 15 years 

See Understanding supplementary codes for more information.  

Question(s) from the Census form

In the main job held last week, what was the person’s occupation?

What are the main tasks that the person usually performs in that occupation?

For the main job held last week, what was the employer’s business name?

What best describes the industry or business of the employer at the location where the person works?

What are the main goods produced or main services provided by the employer’s business?

How this variable is created

This variable is created from the OCC24P variable. An occupation is coded using the Occupation Standard Classification for Australia (OSCA) 2024 v1.0 at the 6-digit level to determine the occupation skill level for the stated occupations.  

The relationship between occupation and occupation skill level is defined in the OSCA. 

Not further defined codes (for example, 100000 Managers, nfd) are not part of the OSCA. These codes are introduced during Census coding to capture responses with insufficient detail to assign a more specific occupation. The lowest skill level applicable to the parent category was used to determine the skill level assigned to each nfd code. For example, the lowest skill level applicable to Major Group 1 Managers is two, so 100000 Managers, nfd was assigned Skill level two. 

History and changes

This variable was added to the 2021 Census dataset in September 2026.   

When the 2026 Census data is released, occupation data will be coded to the OSCA classification, replacing the previous classification, the Australian and New Zealand Standard Classification of Occupations (ANZSCO). 

OCSK24P has been added to the 2021 Census dataset to support comparisons between the 2021 and 2026 Census occupation data. 

Data use considerations

Occupation coding relies on self-reported responses and both automated and manual coding processes. Some respondents provide vague job descriptions, which may be assigned to broader "not further defined" categories, reducing analytical precision. 

OSCA is a new classification standard. Comparisons to the former standard (ANZSCO) may be limited where correspondences do not align one-to-one. 

Detailed occupations in small geographic areas can have very low numbers. This can lead to: 

  • higher variability 
  • confidentiality adjustments 
  • potentially misleading conclusions if percentages are calculated from very small bases 
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