This Manager Dossier offers a concise guide to internal investigations in Switzerland. It addresses key questions such as conducting thorough yet efficient investigations, leveraging AI for efficiency, necessary steps and limitations in document analysis and employee interviews, and cooperation with authorities. It also covers challenges in cross-border investigations and how to address them. Drawing on the authors' extensive practical experience, both in-house and as external counsel, this dossier provides strategic planning, execution, and follow-up guidance. It offers practical advice for efficient crisis management and effective resolution of issues, including implementing corrective actions. This dossier equips readers with the knowledge and tools