• Call-backs can be used to reach difficult-to-reach but critical respondents
• A large number of interviews can be conducted in a short period of time
• Greater potential for receiving unbiased responses
• Greater control over sampling and quotas
• Can get "specialized" responses through screening questions
• Interviewers can ask probing, follow-up, or clarifying questions
• Permits "skip and branching" patterns
Telephone survey disadvantages include:
• Interviews can be easily terminated by respondents
• Respondents are not anonymous to the interviewers
• Costs can escalate quickly
• Cannot use visual aids
• Possible response bias if all interviewers do not conduct the survey in the same manner
hope this help !!!