Response rates in telephone surveys have resumed their decline
Response rates to telephone public opinion polls conducted by Pew Research Center have resumed their decline, to 7% in 2017 and 6% in 2018.
What our transition to online polling means for decades of phone survey trends
What does the migration to online polling mean for the country's trove of public opinion data gathered over the past four decades?
Methods 101: Mode effects
How does the way a poll is conducted influence the answers people give?
Phone vs. online surveys: Why do respondents’ answers sometimes differ by mode?
Pew Research Center conducts surveys over the phone and, increasingly, online. But these two formats don’t always produce identical results.
How highly religious Americans view evolution depends on how they’re asked about it
Evolution remains a contentious issue. When asked about it, highly religious Americans' responses can vary depending on how the question is asked.
The Evolution of Pew Research Center’s Survey Questions About the Origins and Development of Life on Earth
Measuring public opinion on evolution has never been an easy task for survey researchers.
‘Good jobs’ vs. ‘jobs’: Survey experiments can measure the effects of question wording – and more
The way polling questions are asked can influence people's answers. Survey experiments are one way to measure the degree to which different questions elicit different answers.
Defining generations: Where Millennials end and Generation Z begins
Pew Research Center now uses 1996 as the last birth year for Millennials in our work. President Michael Dimock explains why.
Country Specific Methodology
Detailed information on Pew Research Center international survey meethodology, such as mode of interview, sampling design, margin of error, and design effect, for each country we survey, organized by survey, country and year.
How asking about your sleep, smoking or yoga habits can help pollsters verify their findings
Pew Research Center uses benchmarking questions to ensure our surveys are accurate. Learn why and how we use these questions.
