If you think about it, the repertory was the original search engine. Long before Google, Yahoo, and Alta Vista, homeopaths were faced with a problem similar to that which made search engines necessary. The search engine user wants to find a web page with information on a particular subject. And the homeopath wants to a a remedy that has a particular symptom. There's been a lot of research into how to make search engines perform better. Much of this information is proprietary, but there is research done at universities that is available to the public. As far as I know, no one has tried to apply these new methods to homeopathic repertorization. Our modern repertories have grown large, so large they've grown difficult to print and computers are necessary for any serious homeopath. I think soon we will move into the post-repertory era, when we use new computer techniques borrowed from search engines to find the remedy.