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Some extended control is … permissible and even useful, but a free extension of the tact cannot be tolerated, particularly in practical and scientific matters. The verbal community deals with this problem by resorting to another behavioral process which sharpens stimulus control and opposes the process of extension. It reinforces responses in the presence of a chosen stimulus property and fails to reinforce, or perhaps even punishes, responses evoked by unspecified properties. (p. 107)