All States regulate the legal access of migrant workers to the labour market. While each government has its own labour admission system for the selection, recruitment and integration of migrant workers, the most fundamental criteria for their access to the domestic labour market are typically based on quantity (scale/number) or quality (selection).
In a demand-driven approach, employers must demonstrate a need for migrant workers, normally based on labour market shortages determined through labour market tests. Work permits may be used to manage the entry of foreign workers. In a supply-driven system, migrants themselves launch the admissions process, often within a quota or ceiling, and can apply without necessarily having a job offer. Under this approach, governments will have tools, such as quotas and a points system, to attract foreign workers with specific workforce qualifications into sectors with persistent shortages.