Stresses that, in accordance with the mandate given by the General Assembly, the Office of the High Representative for the Least Developed Countries, Landlocked Developing Countries and Small Island Developing States will ensure the coordinated follow-up to, effective monitoring of and reporting on the implementation of the Vienna Programme of Action and will undertake advocacy efforts at the national, regional and global levels, and also stresses that the Office, in collaboration with other relevant stakeholders, should work on developing relevant indicators for measuring the progress on implementing the Programme of Action in landlocked developing countries, within their existing mandates;