Matrix ordering items contain a grid in which elements are in rows, and the sequence numbers are column headers. Online users click or touch radio buttons at the intersections of rows and columns to indicate a sequence number for each element.
Matrix ordering items are accessible with audio presentation and switch responses. Matrix items can be presented in paper-and-pencil and braille test forms because there are no moving parts. Optical scan answer sheets can be used for matrix items because radio button response options can be shown as answer bubbles.
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