The Jesus Seminar
is a controversial project led by Robert Funk at Westar Institute to discuss the question of what Jesus
said and did as a historical person and to judge it by voting using a bead system. Red beads were used to show that Jesus said the passage or something very like the passage. Pink beads were used to show that Jesus might have said something like the passage. Gray beads were used for a passage that Jesus did not say but were Jesus' ideas. Black beads were used for passages Jesus did not say at all. 
The findings of the Jesus Seminar were published in 1993 as The Five Gospels : What Did Jesus Really Say? The Search for the AUTHENTIC Words of Jesus (ISBN 006063040X).