The Three Rs framework — Replacement, Reduction, and Refinement — provides the ethical foundation for laboratory animal use and is increasingly supported by regulatory requirements.
The Three Rs framework represents the most influential welfare innovation in the history of laboratory animal use. Its genius lies in providing a structured ethical framework that can be applied to every aspect of research involving animals, from study design through housing and experimental procedures to endpoint decisions. Refinement extends beyond minimising pain to improving the entire lived experience of laboratory animals through environmental enrichment, social housing, and positive human-animal relationships that reduce background stress and improve both welfare and scientific validity. Regulatory requirements for Three Rs compliance are increasingly robust, though implementation quality varies significantly.