Since learning to speak Czech tends to be one of the biggest barriers to the full integration of foreigners, an increasing number of immigrant-oriented NGOs have established free or low cost Czech language courses as part of their foreigner integration services. Other important services include free legal and social counseling, assistance with employment, health insurance, and education. Most of these NGO centers, which target third country nationals, have offices scattered across Prague 1 to Prague 14, but some also have offices in many cities outside of Prague. Consultations are often provided in Czech as well as Russian, Ukrainian, English, Vietnamese, and Mongolian.