— Eric Enge, Stephan Spencer, Jessie Stricchiola, and Rand FishkinFor more information on reasons why search algorithms sometimes fail, you can read the following SEOmoz article, which was written by Hamlet Batista: http://www.seomoz.org/blog/7-reasons-why-search-engines-dont-return-relevant-results-100-of-the-time
Replicated under Fair Use from The Art of SEO (Theory in Practice) by Eric Enge, Stephan Spencer, Jessie Stricchiola, and Rand Fishkin.