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Since cognition is complex, Engagement, Representation, and Action & Expression are not discrete categories. Instead, they all tend to be interrelated. For example, while the concept interview can serve to support representation of information, it provides a means of expressing knowledge and negotiating meaning verbally. It also supports engagement by giving students choice about how they want to thresh out concepts. Likewise, the Hotwash activity supports engagement but also supports representation by compelling students to condense and articulate key points. It also provides students with a goal or end point for the lecture so that they can plan and coordinate pieces of information with that goal in mind.