(2) The Commission shall not place undue regard on technicalities or rules of procedure and may waive any such rule or requirement when it considers it appropriate. (3) The parties to a dispute shall set the date for the hearing of a dispute within fifteen days from the date of the filing of the last response or any reply to the response. (4) Save where the parties otherwise agree, each party shall be entitled to not less than seven days notice of the time, date and place fixed for the hearing of the dispute. (5) The Commission may determine a dispute on the basis of the documents filed by the parties or oral evidence given before it. (6) Where the Commission considers it necessary or expedient, it may direct the parties to file written submissions upon such terms as the Commission considers fit. (7) Where in the course of resolving a dispute a matter arises that in the opinion of the Commission requires certain expertise or competence, the Commission may call upon any person who possesses the expertise to sit with the Commission as an assessor. (8) At the hearing, the complainant shall open its case by stating the grounds of the complaint and may support it by relevant evidence. (9) A party to a dispute shall, unless the party has the consent of the Commission, not rely on any grounds other than a grounds stated in the letter or Memorandum of Complaint or adduce additional facts or documents that were not referred to in the letter or memorandum of complaint or copies of the documents were not annexed to the letter or Memorandum of Complaint. (10) The complainant shall close its case by making oral or written submissions and at the close of the complainant’s case, the party against whom a complaint has been made may make submissions supported by relevant evidence. (11) The complainant shall be entitled to reply to the submissions of the party against whom a complaint has been made and not raise new issues.