My colleague Nate wrote about using Jaccard for search engine regression testing: https://opensourceconnections.com/blog/2021/07/23/jaccard-index-for-search-reg

My colleague Nate wrote about using Jaccard for search engine regression testing: https://opensourceconnections.com/blog/2021/07/23/jaccard-index-for-search-regression-testing/ https://opensourceconnections.com/blog/2021/07/23/jaccard-in... If you make changes to a search algorithm and the order of results changes too much this can alarm users, so this is a good way to reduce risk.