Until recently, this model was an accurate reflection of the issues that need to be addressed in any SEO campaign. But, as search has advanced and new metrics have been developed that affect search rankings, a new model is necessary to encapsulate the variety of new tasks that are important to any successful SEO campaign. Below is the new search periodic table of the eight elements of SEO:
1) Discovery
2) On Page
3) Off Page
4) Site Wide
5) Universal Search
6) Usability
7) Social Media
8) Analytics