Would agree. I usually try to introduce doubt. Asking questions is the best way. You can do it in a way that makes you sound curious about their approach and fo

Would agree. I usually try to introduce doubt. Asking questions is the best way. You can do it in a way that makes you sound curious about their approach and forces them to answer(defend) their stance. Question. Question. Then. So if this happens like you say, then this will happen to? Is that the desired outcome? Edit, just to add. Try to lead them thorough it like its a critical thinking exercise. If you find yourself struggling with the "path" of questions to ask. Just say something like, I'm not convinced that will work. What makes you think it is the best solution? Key is to make them defend their stance and help them see when there is something they haven't considered