18. (22) The hearing of the Arbitration Board shall commence with the party initiating the arbitration presenting its case summarized in writing and supported by witnesses available for cross-examination. The other party or parties shall similarly present their cases followed by any intervenor. The claimant shall have a final right of rebuttal after which argument shall be made by the parties in the same order, consisting of a summary of the facts alleged and an explanation of any legal propositions advanced.