needs of their children. According to the International Schools Statute issued by the Saudi Ministry of Education, schools implementing curricula other than Saudi ones are regarded as foreign schools. Foreign schools are further categorized as international schools who offer American or British curricula and community-based schools that teach national curricula of their home country and are run or sponsored by their respective diplomatic missions whereas being mostly owned by Saudi investors. As of January 2015, the International Schools Consultancy (ISC) listed Saudi Arabia as having 203 international schools. ISC defines an 'international school' in the following terms "ISC includes an international school if the school delivers a curriculum to any combination of pre-school, primary or secondary students, wholly or partly in English outside an English-speaking country, or if a school in a country where English is one of the official languages, offers an English-medium curriculum other than the country's national curriculum and is international in its orientation." This definition is used by publications including The Economist. In Saudi Arabia some international schools are owned by communities of foreign nationals, while others are private schools owned by individuals with Saudi citizenship. The Saudi government limits community schools to one per locality or city per nationality; diplomatic missions either supervise or directly operate the community schools. These community schools are not required to separate male and female students into separate campuses and are allowed to host social activities with men and women mixed. They are not required to have Saudi citizens as sponsors since the Saudi authorities consider the schools to be under the sponsorship of the diplomatic missions. Czarina Valerie A. Regis and Allan B. de Guzman, authors of "A system within a system: the Philippine schools overseas," wrote that the Saudi Ministry of Education "still exercises restraint in implementing its regulatory functions" on community schools. There may be more than one private school per nationality per city: the number of private schools that may be established is dependent upon the number of Saudi nationals willing to open a school in that city. Unlike community international schools, private international schools are required to follow Saudi regulations, including those related to gender segregation. The British International School, Riyadh teaches from foundation one to high school. Over 80% of its students are British nationals, and the school follows the British curriculum. International Schools Statute The International Schools Regulations issued by the Ministry of