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" "It is what we think we know that keeps us from learning.
Chester Irving Barnard (November 7, 1886 – June 7, 1961) was an American business executive, public administrator, and the author of pioneering work in management theory and organizational studies.
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When a specific desired end is attained we shall say that the action is "effective." When the unsought consequences of the action are more important than the attainment of the desired end and are dissatisfactory, effective action, we shall say, is "inefficient." When the unsought consequences are unimportant or trivial, the action is "efficient.