The Three Rs framework - Replacement, Reduction, and Refinement - underpins animal research welfare globally, but implementation varies enormously between institutions and regulatory frameworks.
The Three Rs framework has driven genuine welfare improvements in animal research over the past 60 years, but implementation remains inconsistent. Refinement improvements - better anaesthesia, analgesia, and housing - are often easier to implement than replacement (which requires validated alternative methods that can take years to develop). The welfare challenge is ensuring that the Three Rs are applied rigorously rather than as a checkbox exercise. Public transparency about animal numbers, species used, and severity levels in research enables civil society scrutiny that drives accountability. Investment in developing and validating replacement methods is the most powerful long-term welfare intervention.