Pragmatic theory of information
（重定向自Pragmatic information）
The pragmatic theory of information (PTOI) is a set of concepts and principles for defining, measuring, and tracking the time evolution of information. PTOI is derived from Charles Sanders Peirce's general theory of signs and inquiry. Peirce explored a number of ideas about information throughout his career. One set of ideas is about the "laws of information" having to do with the logical properties of information. Another set of ideas about "time and thought" have to do with the dynamic properties of inquiry. All of these ideas contribute to the pragmatic theory of inquiry.