Simple Search
In theory, the first ten results are the most relevant to your search, but that is not necessarily accurate. In fact, how a Web site or page gets ranked in the top ten often has more to do with content design factors and the number of visitors it receives than actual relevance.
Bear in mind that a Web site is highly visited for a reason, however. It's a good idea to look at the link titles on the first 5 or 6 pages before refining or revising your search. You will, at the very least, find some great keywords to add to your list.
If the researcher would have clicked the I'm Feeling Lucky button, Google would have skipped the results page and immediately opened up the site or page most relevant to your search. Theoretically, that's the first link. Go ahead, try it out for yourself.
Note: At the very bottom of the page is a Search Within Results option. Clicking on it will keep a revised keyword search within the parameters, or boundaries, of the original results.