The Tennessee State Constitution, adopted in 1870, calls for five justices, no more than two of whom may come from any one of the state's three Grand Divisions (East Tennessee, Middle Tennessee, and West Tennessee) in order to prevent regional bias. For the same purpose, the court is required to convene alternately in Knoxville, Nashville, and Jackson. In recent years this provision has been regarded as permissive rather than restrictive. Therefore, the court has met in other cities, such as Chattanooga, Kingsport, and Memphis, throughout the state as part of a legal education project for high school students called "Supreme Court Advancing Legal Education for Students" (SCALES). SCALES has been instrumental in allowing over 36,000 high school students from over 540 high schools in Tennessee see the Court in action since 1995.