The ranking of the presidents, based on these criteria, is then compared to other rankings by news organizations, colleges, historians, and political professionals. Public opinion surveys on the presidents are also evaluated. Any apparent bias in these surveys is noted and explained. Analysis is made of the trend in these rankings, over time, to raise or lower the ranking of particular presidents, by evaluating an average of mainstream rankings and comparing that average to the ranking developed here as well as to other non-mainstream evaluations. Particular prominent publicly available rankings are also compared directly to the ranking developed here and to a Libertarian ranking. The Libertarian ranking is also compared to this ranking. In addition to performance in specific areas of accomplishment, the presidents are compared from the standpoint of strength, their ability to stand up to opposition or criticism, and other personal qualities.