The Three Rs framework — Replace, Reduce, Refine — provides practical guidance for minimizing animal use in research while advancing scientific knowledge.
The 3Rs framework has driven significant welfare improvements in research over decades. Non-animal testing alternatives have developed rapidly, with organoids and organ-on-chip systems now replacing animal models in some applications previously considered irreplaceable. Statistical consultation to minimize animal numbers during study design is now standard in many jurisdictions. Refinement through better pain management, social housing, and enrichment reduces suffering in animals whose use remains scientifically justified.