3. Members of developed countries shall, upon request, provide technical assistance to members of developing countries on mutually agreed terms. On this basis, members of industrialized countries shall develop technical assistance programmes, which may include, inter alia, staff training, assistance in the preparation of implementing measures, access to sources of information on customs valuation methodology and advice on the application of the provisions of this Agreement. The methods of customs valuation in descending order of priority are as follows: In the case of the fallback method, the customs value may not be based on the following points of interest: the selling price of the goods in the importing country (i.e. . . . . .