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Thanks for following up with me. As I mentioned, the keyword difficulty score is actually based primarily on the websites that are already ranking for the site and how hard it would be to knock those pages out of the top 10 results. If the pages ranking for that keyword, even if the search volume for that keyword is low, it would be difficult to beat the pages that are already ranking. For example, the keyword "clinique visuelle chibougamau" is considered to be a competitve keyword because there are several sites ranking for that keyword that have a very high domain authority (http://screencast.com/t/Y1SiElwUbGd) and several that have a moderately high domain authority (http://screencast.com/t/vtIlKWyLT), so it would be very difficult to push those pages out of the rankings because powerful sites tend to dominate these results and links in quantity and quality (at both the domain and page level) are required to earn top ranking to push those site out of the rankings. I hope this helps. Let me know if you have any other questions. -Chiaryn