APTA recognizes the specific needs of the least developed countries and calls for concrete preferential measures in their favour (Article 3). Participating States may grant special concessions to members of LDCs (Article 7) and undertake to pay particular attention to requests for technical assistance from participating least developed countries. In practice, most members have made specific concessions to least developed countries in successive rounds of trade liberalization (see schedules of concessions for the fourth round here). In the exercise of the powers conferred by Section 5, Subsection (1) of the Customs Tariffs Act 1975 (51 of 1975) and in the replacement of Notification No. 430/1976-Zoll of the 1st.