All surveys on people's satisfaction with the performance of HKSAR government secretaries are telephone surveys conducted by interviewers under close supervision.
Target population of these surveys are Cantonese speakers in Hong Kong of age 18 or above.
Telephone numbers are first selected randomly from telephone directories as seed numbers. Another set of numbers is then generated by using the plus/minus one/two method. Duplicate numbers are then screened out, and the remaining numbers mixed in a random order to become the final sample.
Upon successful contact being made with a target household, one member of the household is selected among those present using the "next birthday" rule.