sentences:  While the cantons are responsible for naturalization, federal Swiss nationality law regulates minimal requirements necessary for naturalization.These requirements were significantly reduced in a 2018 revision of the law, allowing naturalization after a minimal period of residence of ten years, and in certain cases as little as five years (naturalization of spouses and children of Swiss citizens; years of residence at ages 8 to 18 count double).A further requirement is that the applicant be "well integrated" and "familiar with life in Switzerland", and must have 
  both oral and written competence in one of the national languages of Switzerland.