As the big boss of the company you need to be EXTRA careful and set some steps in the right direction for a good Just Culture. Get one step wrong and you loose.
Give your general managers / directors / management team the assignment to have the just culture process designed.
Making sure learning and improvement is the objective
Judgment by peers, not by management
The CEO is instrumental to ensure a good external Just Culture.
And suddenly you, as the CEO, get confronted with a practical case of a serioius mishap. It could be a case of fraud in your company, or a bad safety incident. Your first response may feel like "fire the person!", but please hang on for just a second!