here to tell us more is c-span's project coordinator, rachel katz. let's start with what exactly is this survey. >> the historian's surveys started from a series we did in 1999 called the american president where we did an in-depth program for a year on each of the presidents and their lives and in ministration. it had a lot of great reviews. we wanted to have a capper to that program. there was a lot of interest. we decided to come up with this survey where we reached out to historians and professional observers of the presidency from around the country. and, we asked them to rate presidents on 10 different leadership characteristics. characteristics are public persuasion, crisis leadership, economic management, moral authority, international relations, administrative skills, relations with congress, vision and setting an agenda, pursued equal justice for all, and performance within the context of the time. then we have a ranking of all of the presidents within each of those 10 characteristics, and also in overall ranking. i think it is important to