The practice of showing questions, answer choices, brands or attributes in a different order to different participants in a research study. For example, for a list of five attributes ranging from Attribute A to Attribute E, one fifth of the participants might see or hear Attribute A first, followed by Attribute B, followed by C, D, and E, while another fifth might see or hear Attribute B first, followed by C, D, E, and A. It is also sometimes used to refer to re-ordering of experimental conditions in testing designs. The term “Rotate” is sometimes used interchangeably with “Randomize,” though rotation is a specific type of randomization. (See also “Randomize).”