5 CFR § 1203.16 - Proceedings.

The Board has substantial discretion in conducting a regulation review under this part. It may conduct a review on the basis of the pleadings alone, or on the basis of the pleadings along with any or all of the following:

(a) Additional written comments;

(b) Oral argument;

(c) Evidence presented at a hearing; and/or

(d) Evidence gathered through any other appropriate procedures that are conducted in accordance with law.