Far from competing against one another, the national and international systems of labour regulation are interlocked. ILO standards have been used in recent
rulings by the highest jurisdictions of some countries. Examining two decisions by the Supreme Court of Canada and another by the Paris Court of Appeal, the authors clarify the circumstances in which national courts make use of these international sources of law and consequent legal implications. The cases involve proceedings before national courts and ILO bodies, and France and Canada also have different legal cultures, enabling a discussion of how national jurisdictions actually appropriate international labour standards.