E/C.12/1999/10 page 11 48. In this respect, two features of article 13 require emphasis. First, it is clear that article 13 regards States as having principal responsibility for the direct provision of education in most circumstances; States parties recognize, for example, that the “development of a system of schools at all levels shall be actively pursued” (art. 13 (2) (e)). Secondly, given the differential wording of article 13 (2) in relation to primary, secondary, higher and fundamental education, the parameters of a State party's obligation to fulfil (provide) are not the same for all levels of education. Accordingly, in light of the text of the Covenant, States parties have an enhanced obligation to fulfil (provide) regarding the right to education, but the extent of this obligation is not uniform for all levels of education. The Committee observes that this interpretation of the obligation to fulfil (provide) in relation to article 13 coincides with the law and practice of numerous States parties. Specific legal obligations 49. States parties are required to ensure that curricula, for all levels of the educational system, are directed to the objectives identified in article 13 (1). 23 They are also obliged to establish and maintain a transparent and effective system which monitors whether or not education is, in fact, directed to the educational objectives set out in article 13 (1). 50. In relation to article 13 (2), States have obligations to respect, protect and fulfil each of the “essential features” (availability, accessibility, acceptability, adaptability) of the right to education. By way of illustration, a State must respect the availability of education by not closing private schools; protect the accessibility of education by ensuring that third parties, including parents and employers, do not stop girls from going to school; fulfil (facilitate) the acceptability of education by taking positive measures to ensure that education is culturally appropriate for minorities and indigenous peoples, and of good quality for all; fulfil (provide) the adaptability of education by designing and providing resources for curricula which reflect the contemporary needs of students in a changing world; and fulfil (provide) the availability of education by actively developing a system of schools, including building classrooms, delivering programmes, providing teaching materials, training teachers and paying them domestically competitive salaries. 51. As already observed, the obligations of States parties in relation to primary, secondary, higher and fundamental education are not identical. Given the wording of article 13 (2), States parties are obliged to prioritize the introduction of compulsory, free primary education.24 This interpretation of article 13 (2) is reinforced by the priority accorded to primary education in article 14. The obligation to provide primary education for all is an immediate duty of all States parties. 52. In relation to article 13 (2) (b)-(d), a State party has an immediate obligation “to take steps” (art. 2 (1)) towards the realization of secondary, higher and fundamental education for all those within its jurisdiction. At a minimum, the State party is required to adopt and implement a national educational strategy which includes the provision of secondary, higher and fundamental education in accordance with the Covenant. This strategy should include mechanisms, such as indicators and benchmarks on the right to education, by which progress can be closely monitored.