Considering multifaceted nature of "information", it has been introduced into different terminologies by the different researchers during the last three decades. In this article, we attempt to examine empirically the measurement of a sub-set of "information", namely “Primary information sectors (PIS)”, which requires the following factors: definition and conceptualization, methodology, Process of estimation, and data requirements. Based on the 99 sectors of input-output table derived from a 2002 version as well as the availability of the results from the 2002 manufacturing Census of the country; the size, importance, and scope of the PIS of Iran have been worked out.
The results indicate that the shares of PIS in gross output, value added and final demand are 8, 10.2, and 8.6 percent respectively. However, these percents are relatively less than those shares found in the selected developed and developing countries over the 1960s, 1970s, 1980s, and 1990s.