In my previous article, I raised the issue that proper keyword research must take into account countries. The reason for that was that the demand for keywords can vary between countries. I gave examples of that fact using the Overture keyword tool.
As you may already know, keywords are an essential part of search engine optimization (SEO). And the usual approach recommended to finding the right keywords to target with one's site involves the ideas of demand, supply and KEI (and/or CID). I would like to propose that one thing is missing in this research approach.