Resident service and other services 7 Real estate Scientific research, technical service and geological survey 8 Water conservancy, environment and public facility management Education 9 Health, social security and social welfare Culture, sports and entertainment Cross stratification is conducted by two indicators: regions and combined industries, with a total of 4*9=36 layers. Samples are distributed at each layer according to the distribution of business entities by province, city and industry in the second economic census in 2008. Business entities are randomly sampled from each layer for investigation, and the ultimate effective samples cover a total of 3,000 enterprises. 2.4 Implementation method of the survey This project adopts the approach of Computer Assisted Telephone Interview (CATI). Randomness and accuracy of the survey are controlled as follows: 1） Calls are made from 9 am to 6 pm on working days. 2） After the survey is accomplished, the telephone investigation company is asked to provide the detailed dialing information of all the phones for random checks. 3） To avoid the randomness being influenced by the put-through rate, numbers that cannot be connected will be dialed for at least three times. 4） To avoid the influence of investigator’s personal perspective to the investigation, it is stated that items that are not needed to be read out cannot be given any prompt and the questions should be asked properly. 5） After telephone survey, the data are pre-processed to check the logical relation between the value of a variable and the variable itself. Unqualified samplings shall be all deleted. (III) Automatic Online Search and Data Report Automatic online search is used to conduct technical statistics about the quantity of domain 115115 The 39th Statistical Report on Internet Development in China