1.3 Survey Method The computer-assisted telephone interviewing (CATI) system is adopted for the survey. 1.4 Differences between survey population and targeted population A study for the subpopulation who are not covered by telephones at the end of 2005 by CNNIC shows that Internet users are very few in this subpopulation. Currently, the subpopulation is downsizing gradually with the development of our telecom industry. In this survey, there is an assumption, i.e. Internet users who are not covered by fixed-line telephones and mobile phones are negligible. (II) Enterprise Survey 2.1 Survey Population Business entities in Mainland China (excluding Hong Kong, Macau and Taiwan) excluding privately-owned businesses and other legal entities According to the statistical standard issued by National Bureau of Statistics of the PRC, business entities are divided into eighteen major industry categories: (1) agriculture, forestry, animal husbandry, and fishery; (2) mining; (3) electricity, gas and water production and supply; (4) manufacturing; (5) construction; (6) transportation, warehousing and postal services; (7) information transmission, computer services and software; (8) finance; (9) leasing and business services; (10) wholesale and retail trade; (11) accommodation and catering; (12) residential and other services; (13) real estate; (14) scientific research, technical services and geological prospecting; (15) water conservancy, environmental and public facilities management; (16) education; (17) health, social security and social welfare; and (18) culture, sports and entertainment. 2.2 Sample size There were 3,000 survey samples in total, covering Mainland China. 2.3 Sampling method This survey adopts the approach of stratified random sampling. Standard for regional stratification: Thirty-one provinces, municipalities directly under the central government and autonomous regions are divided into Eastern China, Central China, 113113 The 39th Statistical Report on Internet Development in China