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Correspondence and CoherenceWednesday, January 11, 2017. Peter Drucker: Contribution Analysis. More from Peter Drucker's. Management: Tasks, Responsibilities, Practices. 8220; There are four major groups of activities distinguished by their contribution to a businesses. 8220; There are, first. 8220; There are, second,. Which, while needed, and even essential, do not by themselves produce results but have results only through the use made of their “output” by other components within the business. Hygiene and housekeeping activities.
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