E/C.12/KHM/CO/1 page 12 while the formal education curriculum has only used Khmer as the medium of instruction. The Committee also notes with concern that indigenous communities may lose their culture and language as a result of a lack of education and information in their own languages. (arts. 13, 14 and 15) The Committee recommends that the State party extend the coverage of the Education Law to ensure the right to education to all Cambodian children whose first language is not Khmer. 35. The Committee notes with concern that, while there have been increases in salaries and allowances for teachers in recent years, they still receive lower earnings than a typical civil servant or labourer. The Committee is concerned that the low salary level means that a majority of teachers have to engage in other economic activities such as a second job, resulting in frequent absences from classes thereby affecting the quality of teaching and learning. The Committee notes with concern that low salaries are considered to be one of the reasons for the continuation of the collection of unofficial fees in many schools. (arts. 13, 14 and 15) The Committee recommends to the State party that the civil service reform should put a special emphasis on increasing teacher salaries and incentives, linked to a clarification of teachers’ roles, rights and responsibilities. 36. The Committee requests the State party in its next periodic report, to provide detailed information regarding the impact of its bilateral and multilateral trade and investments agreement on the enjoyment of Covenant provisions by the various sectors of both the urban and rural communities throughout the country. (art. 2.1) 37. The Committee requests the State party, in its next periodic report, to provide disaggregated data gathered annually, on the various provisions of the Covenant, as a tool for assessing the progressive realization of economic, social and cultural rights. (art. 2.1) 38. The Committee urges the State party to ensure that maximum available resources are allocated for the protection and fulfilment of economic, social and cultural rights, especially to the most vulnerable and marginalized individuals and groups. The Committee encourages the State party to foster transparency and accountability to improve effectiveness in the implementation of development programmes funded by international donors, in particular for judicial and institutional reforms and for the improvement of the lives of those living in poverty. In this regard, the Committee draws the attention of the State party to its general comment No. 3 on the nature of States' parties obligations (E/1991/23) and its Statement on “An evaluation of the obligation to take steps to the ‘maximum of its available resources’ under an Optional Protocol to the Covenant” (E/C.12/2007/1). (art. 2.1) 39. The Committee requests the State party to provide, in its next periodic report, detailed information, including statistics disaggregated by sex and by rural and urban distribution, on the extent of the informal sector as well as the State party's policies and protection measures, if any, that take this sector into account. (art. 6)