People rarely have all the information they would like to have when making decisions.
Get as much data as you can. Learn as much as you can.
Eventually, you must make a decision based on what you know, what you’ve been told, and the advice you’ve received. You must make a decision based on what you believe about your product, your business, your team, and yourself. Know your vision, know your mission, and build something great.
In fashion, you cannot make a decision with 100% of the information. You can collect all the data and conduct all the focus groups, but that is a picture of the past. You have to [make decisions] based on demand, feelings, rationality, and emotions.
Marco Bizzarri, President and CEO of Gucci (Fast Company, December 2016/January 2017)