— Eric Enge and Stephan Spencer and Jessie Stricchiola and 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 by Eric Enge and Stephan Spencer and Jessie Stricchiola and and Rand Fishkin.