138It must be pointed out, first of all, that the purpose of the definition of the product concerned in an anti-dumping investigation is to aid in drawing up the list of the products which will, if necessary, be subject to the imposition of anti-dumping duties. For the purposes of that process, the European Union institutions may take account of a number of factors, such as, inter alia, the physical, technical and chemical characteristics of the products, their use, interchangeability, consumer perception, distribution channels, manufacturing process, costs of production and quality.