In every industry job responsibilities change throughout the years. Rand Fishkin shows us how SEO job responsibilities have changed and increased since 1999. He looks at accessibility, keywords, link building, and search verticals. Large-scale industry shifts in the classic SEO model during the past two-and-a-half years have made the greatest impact, he writes, pointing to Google Panda and the behavior of searchers. Fishkin’s list of SEO responsibilities today reveals a more defined industry.