Another way to connect curriculum goals to students' experience is by activating prior knowledge, a term that refers to encouraging students to recall what they know already about new material being learned. Various formats for activating prior knowledge are possible. When introducing a unit about how biologists classify animal and plant species, for example, a teacher can invite students to discuss how they already classify different kinds of plants and animals. Having highlighted this informal knowledge, the teacher can then explore how the same species are classified by biological scientists, and compare the scientists' classification schemes to the students' own schemes. The activation does not have to happen orally, as in this example; a teacher can also ask students to write down as many distinct types of animals and plants that they can think of, and then ask students to diagram or map their relationships essentially creating a concept map like the ones we described in The nature of classroom communication (Gurlitt, et al., 2006). Whatever the strategy used, activation helps by making students' prior knowledge or experience conscious and therefore easier to link to new concepts or information.
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