A great way to get into this with students, according to Gallagher, is by examining tables, charts, and graphs. Here's a chart Gallagher shares with his students (p. 83):
Influenza-related deaths have increased dramatically since the 1970s.
Influenza Deaths Influenza Deaths
1977 1999
Approximately 18,000 Approximately 65,000
Gallagher asks students to fill in the left side of a t-chart by listing everything the chart tells them. They might list the following: influenza deaths rose dramatically between 1977 and 1999; in 1977, there were approximately 18,000 deaths; in 1999, there were approximately 65,000 deaths.
Next, it's time to encourage students to dig a little deeper -- what's not being said in the chart? Students use the right side of their t-charts to brainstorm everything this chart may be leaving out, a list that might include: what caused this dramatic rise in influenza deaths?; where were these deaths? in the U.S.? elsewhere?; who is the source of this information?
Finally, Gallagher asks his students to think about this question: What might have caused such a dramatic rise in flu-related deaths? He records their inferences on the board (such inferences might include: there were more strains of the flu in 1999 than in 1977; people in 1999 had worse medical care than in 1977; flu vaccines stopped working; there were more people in 1999 than in 1977). Gallagher is "train[ing his] students not only to notice what is said, but also to infer what is left unsaid . . . [He] want[s] them to realize that every time something is said, something remains unsaid, and that every time something is written, something remains unwritten" (p. 84).
Bonus: I think this would make a wonderful pre-reading activity if students are about to read a piece of text that includes charts, graphs, and/or tables. Doing this exercise with a graph that's about to appear in the reading students will later do can provide students with an interesting purpose to read -- perhaps they will learn more through reading the entire text, and, if they don't, what will this tell them about this particular source? Students could even be encouraged to conduct further research (a lovely extension activity!).
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