I	Group 1 is the absolutely most relevant; the very small number of titles where the primary title contains the search as a phrase (e.g. Good To Great).
II	Group 2 is the rest of the cream, "Best Bets" if you will. The items in it are weighted more heavily because of where and how the terms appear in the record (e.g. Paralegal success: going from good to great in the new century).
III	Group 3 is more things you would have found doing an adjacency search, but those deemed less relevant than the first group (e.g. Coaching, mentoring, and managing which has the phrase "good to great" in the summary).
IV	Group 4 broadens out farther and begins to pull in some AND results, but still contains items weighted more heavily because of where and how the terms appear in the record (e.g. Ageless : what every woman needs to know to look good and feel great).
V	Group 5 brings in the remaining results matching the search (e.g. 100% pure Florida fiction : an anthology which has “great” in the contents and “good" and "to" in the summary).

All groups are ordered by your default Keyword sort order (Alpha/Date/Relevance).

Here are the top records retrieved with the search terms dogs cats:

If no results are found in these groups, the system can still fall back to an OR search:

In this case no results are found that contain the search terms in a phrase (Versailles France weather ) or all of the search terms somewhere in the record (Versailles AND France AND weather ). Since no results are found in any of the RightResult groups, a search for Versailles OR France OR weather is executed, retrieving the records in the database that most closely match the given search terms.