Power to call for information enables the Commission to compel document production and summon witnesses for evidence collection. Regulation 44 empowers the Commission and, as applicable, the Director General to require parties or other persons to produce documents or material objects, direct discovery and production of evidence, requisition public records, and examine books, accounts or other documents in any person's custody. It also authorises summoning and enforcing the attendance of witnesses and examining them, including examination on oath, at any time before passing orders to enable the Commission to obtain necessary evidence.