The principles of control theory are presented, and their connection to Q methodology is described. The perceptual prerequisites of the Q-sorting task are considered, and the perceptual levels of control theory are related to the selection of Q statements and conditions of instruction, and to the interpretation of factors. The conclusion is reached that control theory has advantages over the quantum and interbehaviour theories often associated with Q methodology.

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Journal Operant Subjectivity
David M. Goldstein. (1991). Q Methodology and Control Theory: II. General Considerations. Operant Subjectivity, 14(2), 61–74. doi:10.15133/j.os.1991.002