133In the fourth place, it is clear that this interpretation is also in line with the purpose of the anti-dumping investigation which consists, for the EU institutions, in seeking objective evidence, by using the tools put at their disposal by the basic regulation and on the basis of the voluntary cooperation of economic operators, namely, in particular, the replies to the anti-dumping questionnaire, any on-the-spot verification visitss and the observations of the interested parties on the information documents, as has been recalled in paragraph 107 above, in order to establish the existence of any dumping after having determined the normal value of the product concerned in accordance with Article 2 of the basic regulation.