Writing an effective questionnaire is not a task for novices. At the very least, it requires an understanding of four basic issues: Considering the differences between a questionnaire that respondents ...

Anyone who has taken a survey has likely been given the option to “check all that apply” when answering a question. The instruction is widely used in data collection because of its ease and efficiency ...

A behind-the-scenes blog about research methods at Pew Research Center. For our latest findings, visit pewresearch.org. Pew Research Center often conducts surveys around the globe on sensitive topics, ...