42 Particular criticism is made of the Master's reliance on Sousaari v Steinhardt (1989) 2 Qd R 477 which, it is submitted, was misplaced and led her into error on the apportionment exercise. Counsel points to the fact that the employer in Sousaari knew of the danger and yet was held to be 40% liable as against 60% apportioned to the manufacturer. Here, there was no evidence that the appellant knew of the danger, only that it should have known. It is submitted that the Master confused the percentage contributions actually found in Sousaari.
43 I should mention that Mr Toomey also submits that the Master was wrong to find that the appellant was vicariously liable to the plaintiff because there was no evidence that the act of attaching the cables was carried out by an employee of the appellant. It could have been done by the plaintiff himself.
44 This submission should be put to bed promptly. There was in fact no evidence or reasonably available inference that it was the plaintiff who attached the cables to the wrong attachment point. I accept the submission of Mr Sexton SC, on behalf of the respondent, that the only conclusion reasonably available on the evidence was that the erroneous attachment was performed by an employee of the appellant and not by the plaintiff, nor by any third party.
45 Apportionment of liability as between joint tortfeasors is a discretionary decision and one which 'is not to be lightly reviewed', Podrebersek v Australian Iron & Steel Pty Ltd (1985) 59 ALJR 492 at 494. See also Liftronic Pty Ltd v Unver (2001) 75 ALJR 867 at 868, 873 and 877 and more recently, Spencer v Balranald Shire Council [2002] NSWCA 102.
46 To set aside an apportionment under s 5, it must be shown that the failure to properly exercise the discretion involved in the apportionment involved an apportionment which was unreasonable or plainly unjust, Oxley County Council v MacDonald [1999] NSWCA 126 at [55].
47 As Fitzgerald AJA said in Rolls Royce Industrial Power (Pacific) Ltd v James Hardie & Coy Pty Ltd (2001) 53 NSWLR 626 at 653 [172], an appeal court is not entitled to interfere if the trial judge's apportionment was reasonably open.
48 In Wynbergen v Hoyts Corporation Pty Ltd [1997] 72 ALJR 65 at 58 it was stressed that the task involves a comparison of the relative culpability of the parties and the relative importance of the acts of the parties in causing the damage.
49 An apportionment finding is one of balance and relative emphasis and the weighing of considerations. This, of perforce, involves individual choice and discretion in which minds may well differ, Podrebersek at 493 - 494 and Liftronic at 868 et al. See also James Hardie & Coy Pty Ltd v Roberts (1999) 47 NSWLR 425 at 446, Fitzgerald v Dansey [2001] NSWCA 339 and Dunnet v Brennan (2000) 31 MVR 362.
50 The appellant conceded that it failed to adequately instruct the plaintiff and indeed other employees. The Master was entitled to find that it was the lack of instruction which led to one of the appellant's employees connecting the cables to the wrong attachment point and that this was the most important cause of the accident. Indeed, the evidence of the appellant's expert, Mr Simpson, was that the incorrect connection of the cable by an employee of the appellant was the most important factor, and that the second factor in importance was the failure of the appellant to properly instruct the driver.
51 In my opinion, it was also clearly open to the Master to find that an additional cause of the accident was the location of the eyelet attachment point in close proximity to the cable attachment point.
52 For an 'untrained person', there existed the possibility of confusion and mistake. The respondent was originally responsible for this situation since it had not carried out the modification required by the appellant but had taken a 'short cut'. However, as against this, it is plain that the appellant had known about the situation from around March 1994 (more than 4 years before the accident) but had done nothing to rectify it. One assumes that nothing was done because of Birch's familiarity with the system. However, when Birch left the appellant's employ, nothing was done to train staff or to ensure employee safety.
53 The third cause of the accident identified by the Master was the position of the locking mechanism. As counsel for the respondent observed, this was not an independent cause of the accident, but came into play if the cables did not hold. The appellant challenges the finding of the Master that both parties were responsible for the location of the locking mechanism.
54 In my view, the Master was entitled on the evidence to so find. The evidence satisfies me that the respondent was not retained by the appellant to advise it on the adequacy of the design. The respondent was engaged to customise a new body for the truck so as to be, with minor modifications, identical to the original. It was reasonably open to the Master to find that the respondent was instructed to 'virtually copy' the existing truck. All of the modifications required to the existing truck emanated from the appellant, or its agent, not from the respondent.
55 It does not follow simply because the respondent was the manufacturer that it is to be affixed with complete responsibility for the inappropriate location of the locking mechanism. The respondent conceded that, as manufacturer, it owed a duty of care to the plaintiff with regard to any design defects. However, as a matter of contract with the appellant, it does not appear that the respondent was retained to design the locking mechanism, or for that matter, any other component of the truck body. The Master was entitled to find on the evidence that the appellant was satisfied with the locking mechanism and also to find that it was the appellant who had suggested the height of the locking mechanism.
56 The appellant seeks to make much of the submission that the respondent had a responsibility to identify and advise the appellant of any risk and of alternatives available. Leaving aside whether the respondent has such a responsibility under contract or otherwise, it is obvious that employees of the appellant were aware of the situation. Any employee of the appellant who had anything to do with setting up the truck knew of the existence of eyelets. That is, except the plaintiff, who was never told or instructed. Birch was clearly aware of the situation but he left the employ of the appellant shortly before the plaintiff started. In any event, the eyelets were obvious and it was foreseeable, as the Master found, that the cables could be erroneously attached to the eyelets by an untrained person. One did not need to be an engineer to appreciate that the eyelets were not there to be used to attach the cables. While whoever attached the cables before the accident was very inattentive or stupid, it was a risk which the appellant should have appreciated without an engineer's inspection or advice. And if the appellant was in fact ignorant of the risk, it is plain from the evidence of Mr Simpson, its own expert, that it should have been so aware.
57 In approaching the apportionment exercise, I am unable to conclude that the Master made any error of fact or came to conclusions on causation which were not available on the evidence. It is simply not to the point to say that were it not for the respondent's breach, the accident would not have happened. One could extend such examples manifold but be none the wiser in order to carry out an exercise in the apportionment of blame under s 5 of the statute.
58 In my opinion, the Master was entitled, indeed correct, to find as she did in her identification of the causes of the accident. She was also entitled, and I would agree, to identify the primary or main cause as being the appellant's employee attaching the cables to the wrong attachment point. Concerning the principal cause, it is plain that the appellant was wholly responsible.
59 Another cause of the accident was the location of the curtain eyelet attachment in close proximity to the cable attachment point. On this, I agree with the Master that the respondent was wholly responsible.
60 The third contributing cause identified, the location of the locking mechanism, was properly able to be characterised, having regard to the evidence, to the joint fault of the employer and the manufacturer.
61 The Master, having identified the causes of the accident, and the respective negligence of the parties within those factual contexts, had to balance them against one another and indeed, within each cause, particularly the third.
62 Accepting that the Master was correct in her attribution of the primary cause, as I am, it is very difficult to successfully attack the discretionary exercise in apportionment. A moment's reflection will reveal why this is so. If, for example, one assumes the primary cause as constituting 60%, it is reasonable to apportion this entirely to the appellant. If one then fixes the other two subsidiary causes at 20% each, and applies the Master's approach to blameworthiness, then it is easy to see how she arrived at a 70/30 apportionment. Making some adjustments to these percentages, used for the purpose of illustration only, leads to little different result.
63 I am unable to see how it can be said that the apportionment was not well within the discretion of the judicial officer and I am unpersuaded that a case has been made out for intervention by the court.
64 I should mention Sousaari because of the appellant's reliance upon it and the Master's error in relation to it, as conceded by the respondent. The Master considered it to be an instructive authority. Indeed, it is. However, in considering the case she erroneously stated that the employer was ordered to contribute 60% and the manufacturer was liable for 40%. In fact it was the other way around. However, I do not think that this mistake led the Master into further error or tainted her approach to assessing a just apportionment.
65 There are obvious distinguishing features between Sousaari and this case. The most important is that in Sousaari the employer gave instructions to its employee not to do what the worker did. So there was an attempt, albeit imperfect, to discharge the employer's duty. In this case, the appellant made no attempt at all to give instructions to any employee, including the plaintiff, as to how to attach the cables.
66 Furthermore, a reading of Sousaari makes it clear that the confusion generated by the design was much greater than in this case. It was not surprising that the plaintiff in Sousaari was confused whereas that was not necessarily the case here.
67 Bearing in mind these distinctions, I do not see that the Master's mistake with the percentages in Sousaari led her into any error in the apportionment exercise in which she was engaged.
68 In my opinion, the appellant has not shown that the apportionment of the Master was not a just and equitable one having regard to the respective parties' responsibility for the damage. This aspect of the appeal should therefore be dismissed. Likewise, it follows from my discussion of the respective negligence of the parties and the Master's approach to the contribution exercise, that the cross-appeal should be dismissed. It is fair to say that Mr Sexton regarded the cross-appeal as essentially a defensive one.