The International Medical Device Regulators Forum (IMDRF) has published two final documents: the Playbook for Medical Device Regulatory Reliance Programs IMDRF GRRP WG N89 FINAL 2026 and Considerations for the Selection of IMDRF Adverse Event Terminology IMDRF AET WG N86 FINAL 2026. The reliance playbook, developed by the Good Regulatory Review Practices Working Group, provides structured guidance for regulatory authorities on establishing and operating reliance programmes for medical devices, including in vitro diagnostics. It explains how regulators may give significant weight to assessments or decisions of trusted reference authorities while retaining responsibility for final decisions. The document outlines three principal models, namely work sharing, abridged regulatory pathways and recognition, and sets out practical steps for implementation, including assessing legal frameworks, defining scope and eligibility, engaging stakeholders, formalising processes and agreements, and establishing oversight and performance monitoring systems to ensure effective and proportionate use of reliance.