The NC3Rs have developed a free online tool to help you self-assess and develop an institutional 3Rs strategy. The tool supports you to confidentially review your current 3Rs practices, giving tailored feedback on how you can prioritise and strengthen the 3Rs environment in your institution. It is designed to be practical and informative and suggests positive steps for putting the 3Rs into practice. To follow on from your self-assessment, guidance on developing and implementing an institutional 3Rs strategy has been developed.