A principal contractor who organises an activity involving multiple independent contractors on a site with known hazards may breach its duty of care by failing to make the site safe (e.g., covering or meshing damaged skylights), even where the contractors are competent to control their own systems of work. The duty does not require on-site supervision but does require ensuring the workplace is safe before work begins. Apportionment of liability between tortfeasors under s 7 of the Law Reform (Contributory Negligence and Tortfeasors' Contribution) Act 1947 (WA) involves a broad discretion that will rarely be disturbed on appeal.
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