(c) where there is a clear demarcation between that issue and all other issues in the case, including issues going to the credit of witnesses: CBS Productions Pty Ltd v O'Neil (supra, at 606 per Kirby P), Tallglen v Pay TV Pty Ltd (supra, at 142 per Giles CJ in Comm D), Rajski v Carson (1988) 15 NSWLR 84 at 88 per Kirby P and Hope JA.
(5) Conversely, the separate determination of an issue will rarely be an appropriate procedure where:
(a) there are intertwined issues of fact or law between the separated question and the other questions such that the determination of the separate question will not have any substantial effect upon the width of the field of litigious controversy or the prospect of the settlement of the balance of the litigation: Law Society of NSW v Bruce (unreported, Supreme Court of NSW, 23 April 1996, per Rolfe J), Parramatta Stadium Trust v Civil and Civic Pty Ltd (unreported, Supreme Court of NSW, 27 August 1996, per Hunter J).
(b) where there is a commonality of witnesses and issues of credit as between the separate issue and other issues in the case which will or may necessitate a ruling on the credit of one or more of the common witness, thus possibly precluding that same judicial officer from again dealing with the matters going to the credit of the common witness in accordance with the decision of the Court of Appeal in Australian National Industries Ltd v Spedley Securities Ltd (in liq) (1992) 26 NSWLR 441: Story of Sydney Pty Ltd v Ling (unreported, Supreme Court of NSW 15 November 1994, per Rolfe J), Century Medical v THLD [2000] NSWSC 5; (unreported, Supreme Court of NSW, 3 February 2000, per Rolfe J).
(c) there is a possibility that the resolution of the separate issue will not finally determine the issue but will merely result in an appeal from that decision in relation to that separate issue, creating a multiplicity of proceedings, interruption to the court and undesirable fragmentation of the proceedings: Story of Sydney Pty Ltd v Ling (supra), Century Medical v THLD (supra).
(6) The experience of courts suggests that the separation of proceedings often does not result in the quicker and cheaper resolution of proceedings as anticipated, but often has the reverse effect, merely causing added delay and expense to the resolution of the litigation. Thus, before an issue is to be separately determined, it must be possible to clearly see that it will facilitate the quicker and cheaper resolution of the proceedings: Tallglen v Pay TV Pty Ltd (supra, at 142 per Giles CJ in Comm D), Parramatta Stadium Trust v Civil and Civic Pty Ltd (supra), Century Medical v THLD (supra).
As Giles CJ in Comm. D (as his Honour then was) said in Tallglen (supra, at 142):
'Part 31, rule 2 of the rules empowers the court to make orders for the decision of any questions separately from any other question, whether before, at or after any trial or for the trial in the proceedings, and for the statement of a case and the question for decision. In the ordinary course, all issues in proceedings should be decided at the one-time, but separate decision of a question may be appropriate where, for example, the decision of the question is critical to the outcome of the proceedings and (at least if decided in one-way) will bring the proceedings to an end. In particular circumstances the separate decision of a question may be appropriate even if it will not bring the proceedings to an end, such as where there is a strong prospect that the parties will agree upon the result when the core of their dispute is decided or where the decision will obviate unnecessary and expensive hearing of other questions, but such occasions must be carefully controlled lest fragmentation of the proceedings (particularly when the exercise of right of appeal is borne in mind) brings delay, expense and hardship - that which the making of an order was intended to avoid. It is often the case that the need to make findings of fact for a decision of the separate question, especially findings which may involve issues of credit, tells strongly against the making of an order because related facts, and renewed issues of credit, will or may arise at a later stage in the proceedings . Experience teaches that it should be able to be seen with clarity that decision of a separate question will be beneficial in the conduct of the proceedings and the resolution of the parties dispute.' [emphasis added]"
11 Both parties agree that the Court has a discretion to order separate trials if in all the circumstances, justice can be done between the parties and the disposition of the separate question can be described as just, quick and cheap.
12 More recently in Tepko Pty Ltd v Water Board [2001] HCA 19; 75 ALR 775, Callinan and Kirby JJ made pithy comments in relation to the use of severing issues to be determined by the court. At paras [168] to [172] their Honours stated:
"The appeal should be allowed. However, we should not leave this case without making four comments. Both Mason P and Fitzgerald JA were critical of the course of limiting the issues to be tried that the primary judge adopted. In Perre v Apand Pty Ltd attention was drawn to difficulties that can be caused when that course is adopted. In light of the experience in this case, what was there said should be restated with emphasis. The attractions of trials of issues rather than of cases in their totality, are often more chimerical than real. Common experience demonstrates that savings in time and expense are often illusory, particularly when the parties have, as here, had the necessity of making full preparation and the factual matters relevant to one issue are relevant to others, and they all overlap.