Inspections of a workplace often led by a labour inspector with respect to the upholding of current labour regulations but carried out in conjunction with one or more public authorities, for example, tax authorities, social security institutes, the police, and/or migration authorities. This enables a more joined-up approach to tackling undeclared work.

Inspections undertaken by the competent authority of one Member State on its territory, with participation of the competent authorities of one or more other Member State(s) concerned. Concerted inspections in the cross-border context are inspections undertaken by the competent authorities of two or more Member States simultaneously and related to the same case, with authorities in Member States operating in its own territory and with its own staff.