A variety of educational alternatives exist at the elementary, secondary and tertiary level in four categories: school choice, independent schools and home-based education. The U.S. Department of Education's document State Regulation of Private Schools reports on the legal requirements that apply to K-12 private schools in each of the states, including any curriculum requirements. The report states that it is intended as a reference for public and nonpublic school officials and state policy-makers.[8] The report confirms that similar areas of education are approached in a variety of ways.