The four basic survey methods include mail surveys, telephone surveys, online surveys and personal interview surveys. Match the characteristic listed to the survey method that it is associated with. One method may be used more than once This is the least expensive method if there is an adequate response rate. This is the most expensive survey method. This is the most inflexible survey This is a flexible survey method because interviewers can ask probing questions, but observations are impossible A Mail Surveys B. Telephone Surveys C. Online Surveys D. Personal Interview Surveys method. v Interviewer bias is eliminated, survey can be returned anonymously