Dr. Zivony would like to study the association between empathy and academic performance among children. He sends two observers to several children's schools, and they rate the children on their sensitivity to their friends' and teachers' feelings. The observers label the children "completely insensitive," "slightly empathetic," or "very empathetic." Dr. Zivony, upon studying the observers' ratings, notices a great deal of disagreement as to the children's empathy levels. In this case, the measure of empathy level has poor: