3. A determination of the Union interest for the purpose of point (b) of Article 13(2) shall only be made where all interested parties have been given the opportunity to make themselves known, to present their views in writing, to submit information to the Commission or to apply to be heard by the Commission, in accordance with the time limits specified in point (b) of Article 4(8). Requests for a hearing shall outline the reasons pertaining to the Union interest in relation to which the parties wish to be heard.