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Barnard looked at organizations as systems of cooperation of human activity, and noted that they are typically short-lived. It is rare for a firm to last more than a century. Similarly most nations last for less than a century. The only organization that can claim a substantial age is the Roman Catholic Church. According to Barnard, organizations are not long-lived because they do not meet the two criteria necessary for survival: effectiveness and efficiency. Effectiveness, is defined the usual way: as being able to accomplish stated goals. In contrast, Barnard's meaning of organizational efficiency differed substantially from the conventional use of the word. He defined efficiency of an organization as the degree to which that organization is able to satisfy the motives of the individuals. If an organization satisfies the motives of its members while attaining its explicit goals, cooperation among its members will last.
Barnard was a great admirer of Talcott Parsons (1902–1979) and he and Parsons corresponded persistently. The two scholars would send manuscripts for commentary to each other and they would write long letters where they engage in a common theoretical discussion. The first correspondence between Barnard and Parsons began in the end of the 1930s and it persisted essentially to Barnard’s death in 1961.