2. The role of the PRB shall be to assist the Commission to carry out the tasks of the Commission related to the detailed functioning of the performance and charging schemes laid down in Articles 21 to 27 and in Articles 29 to 32, respectively, as well as under Article 34, and in the implementing acts referred to in Articles 28 and 33. For this purpose, the PRB shall provide opinions, recommendations, guidance material and reports to the Commission, in line with the priorities defined by the Commission.