The General Social Security Act states that, in those Social Security Schemes in which it is so required, Special Systems can be established in one or several of the following areas: inclusion, affiliation, contribution payment methods or collection.

These Special Systems were created in the General Scheme, and therefore they are governed by the common regulations of the General Scheme, with the exception of the particular conditions specifically provided for in each one of them.

The current existing special systems are:

• Permanent-intermittent workers employed by market research and opinion poll companies.
• Permanent-intermittent workers employed by cinemas, dance-halls, night-clubs and discotheques.
• Special hotel industry services.
• Resin industry.
• Fruit, vegetables and canned vegetable industry.