For further information, visit www.audiciaux.fr, www.scobex-rgpd-dpo.fr and www.dpo-externe-rgpd-france.fr. This manual guides organisations in the implementation of ISO 21502, the project management standard. It details its principles, its requirements and its integration with existing practices. From gap analysis to governance, including risk management and auditing, it offers a structured framework for optimising project management and ensuring effective and sustainable compliance.