The relationships of Dick & Perry and Eric Harris & Dylan Klebold are eerily similar. While using In Cold Blood as our foundational text, students jigsaw the articles mentioned in the product. I assign five students to read the same article, they complete the included handout individually, and then discuss their answers. I then divide the groups so that each student can summarize their article to students that have not read it. (I have classes of 35, so I then have groups of seven.) As each student summarizes their article, the rest of the group takes notes on the provided handout.
I did not copy and paste the articles to avoid copyright issues, but each will come up easily when entered into Google with the title and author. PLEASE NOTE: I copy and paste articles for my students as some require censoring; for instance, the article "I'm Full of Hate and I Love It" requires HEAVY editing on the part of the teacher as this source includes graphic language from Eric Harris's journal.
Each article provides unique information from a variety of perspectives. High school students today know little about the Columbine shootings, so they must rely on their jigsaw group to fill in gaps with information found in other articles. For instance, one article is written by Dylan's mother, while another provides frightening notes Eric's journal. The articles provide a great discussion on author bias, author's purpose, and tone. Students coming to the new group having read the article by Dylan's mom have a radically different perspective than those that read Eric's diary entries.
Once students share their articles in their second group, they work together to compare Perry & Dylan and Dick & Eric on the provided Venn diagram using textual evidence from the novel and the articles.
I highly recommend visiting Dave Cullen's website http://columbine-online.com/ for more teaching resources on Columbine.