Tribunal procedural autonomy: tribunals may adopt non CPC procedure while exercising civil court powers for evidence and enforcement. Tribunal procedure is guided by principles of natural justice, not the Code of Civil Procedure, and the Tribunal and Appellate Tribunal may regulate their own procedure. For statutory functions they have civil court powers to summon witnesses, compel document production, receive affidavit evidence, requisition public records, issue commissions, and deal with ex parte/default matters; their orders are enforceable as court decrees and proceedings are regarded as judicial proceedings.