The phrase 'all matters in dispute in the proceeding' in O 6 r 8(1)(b) of the Federal Court Rules extends beyond matters arising on the existing pleadings to include disputed issues of fact subjacent to the pleadings, including the question of which of two potential defendants is liable. Where a defendant raises a defence that, if successful, would necessarily point to the liability of a non-party, joinder of that non-party is warranted to avoid the risk of inconsistent judgments and the need for duplicative proceedings.
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