General systems are responsible, for example, for overseeing labour and employment conditions, along with issues related to the work environment and labour relations. In some cases, they are also responsible for vocational training, migration and social security. In contrast, specialized systems are targeted toward specific contents and are usually supervised by one or more central units. Between these two categories, there are systems based on interdisciplinary teams, in which a single inspector has the professional competencies needed to provide a multifunctional service in each local labour inspection service.