Recent doubts about whether social systems can be controlled in a cybernetic sense depend upon a view of cybernetics that overemphasizes communication, information processing and feedback at the expense of what computer scientists call preprocessing: the conscious selection and structuring of information to facilitate its processing. Much as rationalization was a complement to bureaucratic control in Max Weber's time, the preprocessing of information, prior to its processing by computer, serves societal control today. Indeed, phenomena like rationalization and symbolization can be viewed as forms of preprocessing; they facilitate the crucial control function of self‐referencing. US census data show a monotonic increase in the percentage of the work force engaged in preprocessing relative to the other informational activities: synthesizing, programming and processing.