Apportionment of responsibility between tortfeasors under s 24(2) of the Wrongs Act 1958 must reflect both culpability and causation; an apportionment driven solely by causation — such as an equal division based on the reasoning that neither factor alone would have caused the injury — constitutes specific error. Multiple defendants may be grouped for the purposes of assessing contribution, but the grouping must not hermetically seal the groups so as to predetermine the apportionment by reference to causation alone.
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