The document discusses key features of bar graphs and identifies errors in sample bar graphs. It provides instructions for students to create their own bar graph showing road deaths in New Zealand from 1990 to 2006 based on data provided. Students are asked to describe their graph and answer questions about changes in road deaths between years, with the largest drop being 83 people from 1990 to 1992 and the smallest drop being 13 people from 1996 to 1998.