may be experts of the very specific legal field handled by the tribunal (e.g., labour law, human rights law, immigration law, energy law, workers' compensation law, liquor licensing law, etc.) who hear arguments and evidence provided by lawyers (also lay advocates in British Columbia or Licensed Paralegals in Ontario) before making a written decision on record. Depending on its enabling legislation, a tribunal's decisions may be reviewed by a court through an appeal or a process called judicial review. The reviewing court may be required to show some deference to the tribunal if the tribunal possesses some highly specialized expertise or knowledge that the court does not have. The degree of deference will also depend on such factors as the specific wording of the legislation creating the tribunal. Tribunals whose enabling legislation contains a privative clause are entitled to a high degree of deference, although a recent decision of the Supreme Court of Canada has arguably lowered that degree of deference. Tribunals which have the power to decide questions of law may take into consideration the Canadian Charter of Rights and Freedoms, which is part of Canada's constitution. The extent to which tribunals may use the Charter in their decisions is a source of ongoing legal debate. Appearing before some administrative tribunals may feel like appearing in court, but the tribunal's procedure is relatively less formal than that of a court, and more importantly, the rules of evidence are not as strictly observed, so that some evidence that would be inadmissible in a court hearing may be allowed in a tribunal hearing, if relevant to the proceeding. While relevant evidence is admissible, evidence which the adjudicator determines to have questionable reliability, or is otherwise questionable, is most likely to be afforded little or no weight. The presiding adjudicator is normally called "Mister/Madam Chair". As is the case in court, lawyers routinely appear in tribunals advocating matters for their clients. A person does not require a lawyer to appear before an administrative tribunal. Indeed, many of these tribunals are specifically designed to be more representative to unrepresented litigants than courts. Furthermore, some of these tribunals are part of a comprehensive dispute-resolution system, which may emphasize mediation rather than litigation. For example, provincial human rights commissions routinely use mediation to resolve many human rights complaints without the need for a hearing. What tribunals all have in common is that they are created