E/C.12/LIE/CO/2-3 D. Other recommendations 33. The Committee encourages the State party to consider ratifying the Optional Protocol to the International Covenant on Economic, Social and Cultural Rights. 34. The Committee recommends that the State party consider ratifying the Convention on the Rights of Persons with Disabilities and the International Convention on the Protection of the Rights of All Migrant Workers and Members of Their Families. 35. The Committee recommends that the State party take fully into account its obligations under the Covenant and ensure the full enjoyment of the rights enshrined therein in the implementation of the 2030 Sustainable Development Agenda at the national level, with international assistance and cooperation when needed. Achievement of the Sustainable Development Goals would be significantly facilitated by the State party establishing independent mechanisms to monitor progress and treating beneficiaries of public programmes as rights holders who can claim entitlements. Implementing the Goals on the basis of the principles of participation, accountability and non-discrimination would ensure that no one is left behind. 36. The Committee recommends that the State party take steps to progressively develop and apply appropriate indicators on the implementation of economic, social and cultural rights in order to facilitate the assessment of progress achieved by the State party in complying with its obligations under the Covenant for various segments of the population. In that context, the Committee refers the State party to, inter alia, the conceptual and methodological framework on human rights indicators developed by the Office of the United Nations High Commissioner for Human Rights (see HRI/MC/2008/3). 37. The Committee requests that the State party disseminate the present concluding observations widely at all levels of society, in particular among parliamentarians, public officials and judicial authorities, and that it inform the Committee in its next periodic report about the steps taken to implement them. The Committee encourages the State party to engage with the Human Rights Association and non-governmental organizations and other members of civil society in the followup to the present concluding observations and in the process of consultation at the national level prior to the submission of its next periodic report. 38. In light of the follow-up to the concluding observations procedure adopted by the Committee, the State party is requested to provide, within 18 months of the adoption of the present concluding observations, information on the implementation of the recommendations made by the Committee in paragraphs 16 (a) and 25 above. 39. The Committee requests the State party to submit its fourth periodic report, to be prepared in accordance with the reporting guidelines adopted by the Committee in 2008 (E/C.12/2008/2), by 30 June 2022. It also invites the State party to update its common core document, as necessary, and in accordance with the harmonized guidelines on reporting under the international human rights treaties (HRI/GEN/2/Rev.6, chap. I). 6