Abstract
Like so many other occupations, the professions are subject to the ‘uncertainty principle’; that is, their control over a particular domain of uncertainty affords them unofficial discretion and power. For professions, the unique areas of uncertainty are the distinctive knowledge bases, which they control by virtue of their legally protected task monopoly and autonomy. Their knowledge uncertainty has permitted the professions 1) to make discretionary interpretations and applications, increasing their favor with the public and elites; 2) to mobilize public resources for research, expanding their jurisdiction and domain; and 3) to avoid blame for undesirable outcomes of services while gaining prestige for successes. The professions have been able to use the uncertainty of their knowledge in ways which increase both their control over the public and the public's faith in them beyond what is justified by their expertise and ethics.

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