Telephone survey response rates are down across the survey research industry, requiring researchers to explore alternatives that supplement phone surveys.
Gallup research shows that post-paid incentives are highly effective in web-based surveys.
Survey respondents probed after an initial "don't know/refused" response give systematically different answers than those not probed for a response.
Text messaging is widely used in the U.S., but it appears to have significant drawbacks as a primary way to reach survey respondents.
Hear directly from Gallup's methodologists about our latest experiments and recommendations for conducting public opinion research.