6 Content Metrics that Matter in Post-Penguin World
Google Algorithm has evolved over the past decade, and it has been evolving considerably in the past 3 years. The major changes from 2003 to 2010 was towards optimizing the results against sites and brands that were using SEO tactics that were black-hat, and spammy in nature.
Before you decide and pick the testing tool, consensus should be reached on the goal(s) that you are trying to achieve. Preferably, have one major goal.
Google Adwords have enabled Businesses to attract clients with the intent of purchasing a product/service. But a large chunk of visits are still guided through Search Engines. This is because before the client enters the transactional keywords, he will use several informational queries before making the purchase.

1) Competitor Research
With RavenTools announcing that it would no longer use Google’s scrapped ranking data, webmasters and SEOs have started reviewing the need for tracking keyword position. Of all the SERP tracking articles in the SEO blogosphere, there has been conflicting opinions from SEO experts.
Google Search results are not entirely based on algorithms. Human Raters play a crucial role in evaluating algorithm changes. They have to first understand the query type – navigational, informational & transactional. Then they have to evaluate the pages in the search results for relevance and the value it offers to the user. Based on relevance, Human Raters (Quality Raters) have to rate the pages as Vital, Useful, Relevant, Not Relevant, or Off-Topic.