
A lot of bad research results from a mismatch between question and method, usually because people spend more time worrying about the activity (surveys, testing, interviews) than about forming a good question. Even more bad research is designed specifically to provide support for an existing solution. (That’…
You won’t even know whether doing interviews is the right thing until after you’ve written your research question. It might be more effective to read existing literature, or observe people out in the world, or do a competitive analysis instead.