Motion means a request that the Board rule on some question which is subsidiary to the ultimate decision on the outcome of an appeal. For example, the questions of whether a representative's fees are reasonable or whether additional evidence may be submitted more than 90 days after certification of an appeal to the Board are raised by motion (see Rule 609, paragraph (i), and Rule 1304, paragraph (b) 20.609(i) and 20.1304(b) of this part). Unless raised orally at a personal hearing before Members of the Board, motions for consideration by the Board must be made in writing. No formal type of document is required. The motion may be in the form of a letter which contains the necessary information.