For higher level administrative bodies and administrative workers as well as for those professional technical workers who perform direct work with clients, and active knowledge of the Slovene language shall be a condition for taking up employment; in areas in which the equality of the Italian and Hungarian language is determined, the also the languages of these nationalities. Office-technical and unskilled work may be performed by workers who have reached the age of 15.

Source: Report submitted by the Republic of Slovenia pursuant to Art. 25 Para. 1 of the Framework Convention for the Protection of National Minorities
http://www.humanrights.coe.int/minorities/Eng/FrameworkConvention/StateReports/2000/slovenia/slovenia.html#annex2