Do I need to prove language skills or integration for the Swiss C permit?

Integration matters for the C permit. People applying for a residence or settlement permit must prove their knowledge of a national language (German, French or Italian, depending on the region). The required level is based on a phased model that distinguishes between oral and written proficiency and sets a minimum standard. Other integration factors -- such as respect for public safety and order, participation in economic life or education, and no reliance on social assistance -- are also assessed.