From the Harvard Business Review:
Become a Company That Questions Everything

This useful short article asks how companies can foster the kind of environment where employees challenge long-established policies and inefficient processes.

“How can a company create an environment where people are more inclined to question?” the author asks. The answers, in brief:

• A culture of inquiry starts at the top — with leaders who question.
• Questioning should be rewarded (or at least, not punished).
• Give people the time and space to question deeply.
• Provide the tools to question well.

Of course, you can’t literally question everything. There isn’t time, and even trying would be pretty disruptive. So one key critical thinking skill lies in figuring out — and developing an instinct for — which things need to be questioned.