Need numerical data about your product’s UX, but not sure where to start? Check out this list of the most popular quantitative methods to help you pick a tool.| Nielsen Norman Group
20 user-research methods: where they fit in the design process, whether they are attitudinal or behavioral, qualitative or quantitative, and their context of use.| Nielsen Norman Group
Qualitative surveys ask open-ended questions to find out more, sometimes in preparation for doing quantitative surveys. Test surveys to eliminate problems.| Nielsen Norman Group