327 First, the ordinary mode of trial in Western Australia, if an accused is committed on a charge to a superior court or indicted in a superior court on a charge, is a trial by or before a jury. Secondly, that is the mode of trial in this State unless the court makes an order under s 118(1) that the trial of the charge be by a judge alone. Thirdly, the court may only make an order, on an application under s 118(1), 'if' the court is affirmatively satisfied that, in the particular case, it is in the interests of justice to do so. Fourthly, if the court is not affirmatively satisfied that, in the particular case, it is in the interests of justice to make an order for the trial of the accused by a judge alone, the accused must be tried by or before a jury. Fifthly, the requirement for a process of evaluation to be undertaken to ascertain where the interests of justice lie as between the trial of the accused by or before a jury and the trial of the accused by a judge alone, and the requirement that the order not be made unless the court is affirmatively satisfied that, in the particular case, it is in the interests of justice for the accused to be tried by a judge alone instead of by or before a jury, arise by necessary implication from the text of s 118 in the context of the first, second, third and fourth points I have made.