It is said that Google uses Latent Semantic Indexing
(LSI) to check websites for keywords based on relationships between the written content and the keywords. Apparently Google began using LSI to match appropriate Adwords ads to Asdense users' webpages.
When trying to improve the SEO of your webpages, some consideration to LSI should be given, but it is difficult to know which terms Google may consider relevant in its own LSI analysis... unless you use Google's own free resources to help you out!!
I'm talking about a little known resource called Google Sets
, which you can check out at: http://labs.google.com/sets
Simply plug your keywords into the fields and click one of the two buttons (for more or fewer terms). Google will then give you a list of words it would expect to find on a web page that uses your selected keywords.
For example, I entered the terms:
and got these 15 related terms (including the original 5):
If you want more terms, simply click the "Large Set" button at the outset, or the "Grow" button when the list comes up.
Have fun! And write some nice LSI-optimized articles!