This is a worksheet to go along with the 9/11 Interactive Timeline designed by Archetype and engineered by Infusion for the National September 11 Memorial & Museum located at http://timeline.911memorial.org/#FrontPage. This timeline is a compilation of a variety of primary sources from that tragic day. The attached handout has students browse the entire timeline and answer some higher level thinking questions about the primary sources presented. It does a great job having students understand the chaos and destruction of that day. This is a great one day activity to commemorate 9/11 in the classroom.