A principal that provides detailed and unequivocal guidelines to a competent independent contractor for the performance of a dangerous activity is entitled to expect compliance with those guidelines and does not breach its duty of care to the contractor's employees merely by failing to warn of a change in product specifications where the guidelines, properly followed, would have revealed the issue. The scope of a principal's duty does not extend to on-site supervision of a competent contractor's compliance with clear instructions.
The full text is available to signed-in members, including the 2 later cases that cite this judgment.