“Judge a man by his questions rather than by his answers.” - Voltaire (1694-1778)
The best designers I know are good because they like to get their hands dirty. They are not afraid to try something out to see if it works. They have a healthy attitude toward prototyping. Bad design is thinking you have all the answers and therefore no need for questions.
You know that person in your life who is always the first to say ‘That’ll never work’, well next time they do give them a slap. What’s frustrating is that quite often these people can be extremely intelligent and highly convincing in their arguments as to why you needn’t go further with an idea. And you know what, 90% of the time they may very well be right…on the original point. But you know what is insanely criminal in any kind of design? It’s not allowing exploration, often ideas are the genesis for fantastic and unexpected revelations further down the line. Prototyping is so intertwined with creative thinking that to stunt an idea at its source can severely limit the natural design process. Innovative thought can only occur from action, never inaction. So test out an idea and see what tumbles out, the naysayers might be surprised as to what actually does turn out to work.
Now going back to the traits of the best designers… they will without doubt always have confidence. But not cocky overly assured confidence, true and honest understated confidence. They are open to being wrong and indeed relish the prospect as an opportunity to learn. Being wrong broadens their outlook and opens doors. But on the other hand an unwillingness to be wrong can bring those guilty ultimately to ruin. One path leads to exponential growth in wisdom and experience. The other a linear and narrowing path saddled with a deepening propensity for close mindedness. The moral of the story being; prototype, or be prepared for your final designs to fail a lot more. How is that for irony?