Hua DONG,Tongji University Disadvantages of surveys Data are affected by the characteristics of the respondents (e.g.their memory;knowledge; experience;motivation;and personality) Respondents won't necessarily report their beliefs, attitudes,etc.accurately.Disadvantages of surveys Data are affected by the characteristics of the respondents (e.g. their memory; knowledge; experience; motivation; and personality) Respondents won’t necessarily report their beliefs, attitudes, etc. accurately. ©Hua DONG, Tongji University