We reported last September on a fasinating experiment underway named the "Online Discovery of Secondary Terms Associated to a Theme Experiment". The study was being conducted by Orion, a member at SEW forums, who released the details of the experiment today on the SEW forums. There is a nice discussion going on relating to details from the study and questions resulting from it. About the experiment:
His study is a most recent study on competitive queries submitted by professional SEOs. It introduces a methodology and procedure called on-topic analysis, which allows users to discover top, broader, narrower, and optimum terms.
The experiment introduces methodology that Orion explains "is a valuable tool for enabling users to enhance the semantics of theme sites and concept-focused documents". In a nutshell this means the information is very useful for people and professionals wanting to discriminate between on and off topic terms by identifying top, broader, narrower and optimum terms. Which can be very useful in search engine marketing campaigns, and for developing theme sites and documents on the web. Excellent read.
For a link directly to the article, please continue reading the study by E. Garcia, On-Topic Analysis - Online Discovery of On-Topic Terms