What is an essential guideline when writing questions for usability interviews?

Using the same set of questions for each interview ensures consistency in the data collected, allowing for better comparison and analysis of responses across different participants. This approach is crucial in usability interviews because it helps to identify common themes and patterns, which can inform design decisions and enhancements. Consistent questioning also helps mitigate bias, as it creates a standardized environment for all participants, reducing variability that might arise from differing question phrasing or content.

In usability interviews, it is also important to maintain a flexible approach to follow up on participant responses, but having a core set of questions is fundamental for drawing reliable conclusions from the data gathered. This method creates a structure that can lead to more meaningful insights, ultimately contributing to a better user experience design.