f) undertaking type approval of telecommunications equipment and setting rules for their connection to public telecommunications networks; g) determining harmonised interconnection guidelines; h) regulating tariffs, if required; i) administering the national numbering plan; j) regulating access to satellite telecommunications networks; k) protecting the integrity and viability of public telecommunications services; and l) promoting the stability of the telecommunications industry and enhancing fair competition. ARTICLE 10.9 TECHNICAL STANDARDS 1. Member States shall ensure the interconnectivity of telecommunications networks and the interoperability of telecommunications services in the Region by encouraging their regulatory authorities to develop harmonised technical standards for network architecture and equipment which shall include formulating or approving numbering plans and setting technical standards in respect of cellular telephone systems, cable specifications, telephone signaling systems and equipment type approval. 2. For the purpose of this Article, Member States acknowledge that the harmonisation of technical standards should be undertaken in a manner which will not undermine the benefits or advantages of economic restructuring and, to this end, agree that the harmonisation of standards shall only be required to the extent necessary to a) prevent technical damage to public telecommunications networks; b) prevent technical interference with, or degradation of, public telecommunications transport services; c) prevent electromagnetic interference and ensure compatibility with other users of the electromagnetic spectrum; d) ensure users' safety and access to public telecommunications transport networks or services; and e) promote the development of a regional manufacturing industry. ARTICLE 10.10 HUMAN RESOURCE DEVELOPMENT 1. Member States shall co-operate in enhancing the capacity and capability of human resources in the Region to ensure that -