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Researchers who are considering mixing survey research modes or contemplating a transition to a new method should be especially mindful of mode effects.
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.
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