New York Public Library Books for the teen age? Wat does a book need to b to b awarded that?

For a essay i have to describe what New York Public Library Books for the Teen Age have to have and a brief history of the award. I cant find anything on it! Help greatly appreciated

Look at these sites:

http://www.nypl.org/press/2005/booksforteenage2005.cfm

http://www.librarything.com/bookaward/New%20York%20Public%20Library%20Books%20for%20the%20Teen%20Age

http://en.wikipedia.org/wiki/Alex_S%C3%A1nchez_(author)

http://en.wikipedia.org/wiki/New_York_Public_Library