A case may be fully stipulated by the parties and submitted to the Commission or Judge for a decision at any time. The stipulation of facts shall be in writing and signed by the parties or their representatives. The submission of a case under this rule does not alter the burden of proof, the requirements otherwise applicable with respect to adducing proof, or the effect of failure of proof. Motions for summary judgment are covered by Federal Rule of Civil Procedure 56. [51 FR 32015, Sept. 8, 1986, as amended at 74 FR 63987, Dec. 7, 2009]