"It is said in the cases dealing with Rule 47.04 that a question should not be ordered to be tried before other questions unless it can be formulated with sufficient particularity. A further consideration is whether the question can, in justice to the interests of all parties, be determined without the determination of the other questions in the proceedings. In a conventional trial of all issues, each of the parties has the opportunity of bolstering its case from the evidence of any witness called by any party, including those who may be called on issues which, in chief, do not bear upon that case. A party may in this way be unfairly disadvantaged if it is denied the opportunity to elicit this evidence. Furthermore, the credit of a witness called on one issue may be affected by the evidence of that witness or of other witnesses on other issues. The advantage, in terms of saving court time and expense, of trying certain questions or parts of a case before others may be eroded, if not destroyed, where a party at the first trial cross-examines a witness on the deferred questions on the basis that this ordinarily goes to the credit of that witness. Where this course is adopted the cross-examiner is bound by the rule that answers given cannot be contradicted. The position is otherwise if the cross-examination can be justified as going to an issue. These considerations lead to the conclusion that the advantages of the severance of questions for trial before other questions or the division of a trial into parts, as a technique of efficient trial management, may lead to unfair advantage or disadvantage to a party or may prove to be illusory. There is a further difficulty recently adverted to by Kirby and Callinan, JJ. in Tepko Pty Ltd v. Water Board that the procedure has the indirect disadvantage of prolonging the litigation where the determination of the preliminary issue is subject to appeal, so that the remainder of the trial may await the conclusion of a lengthy appeal process. This, together with other considerations, caused their Honours to observe that 'the attractions of trials of issues rather than of cases in their totality are often more chimerical than real' and to counsel the profession that the trial of issues 'should only be embarked upon when their utility, economy and fairness to the parties are beyond question'. From the perspective of a trial judge, it must be acknowledged, too, that the full implications of severance cannot be appreciated without a detailed familiarity with the evidence which might be led on the question or part of the proceeding to be tried first and on those which are to await the subsequent trial. The trial judge, even a judge who has had dealings with the case as the judge managing the litigation, will not normally have such a familiarity. It will be therefore necessary for that judge to rely upon counsel who are more likely to have this familiarity. This is but another aspect of the particular relationship and confidence which must exist between the bench and bar in the efficient management and disposition of litigation. But it also demonstrates the perils of adopting the course against the opposition of any party."