ARTICLE 4 STANDARDISATION OF TRADE DOCUMENTS AND INFORMATION 1. Member States undertake to use internationally accepted standard, practices and guidelines, as a basis for designing, and standardising their trade documents and the information required to be contained in such documents. 2. Member States undertake to encourage and facilitate the use of data processing techniques in processing and transmitting trade data between the various parties and authorities involved in intra-SADC and international trade. 3. Member States shall review national legislation with a view to ensuring that its provisions allow the implementation of paragraph 2 of this Article. In particular, national legislation shall provide for: a) other information transmission methods as an alternative to paper based documentary requirements e.g. magnetic media and tele-transmission; b) other authentication methods as an alternative to hand-written and other paper based signatures; c) the definition of relevant terms by using internationally accepted definitions which take account of data processing media; d) the possibility of using public telecommunication infrastructure and of developing and using private telecommunication lines, for trade data transmission;