Give your general managers / directors / management team the assignment to have the just culture process designed. 

And have them assisted by your highest safety officer. Understand why it is important that line-management takes a big responsibility in this design process.  Make sure the process is transparent to everyone and YOU understand it yourself very well. 

Once it is defined, NEVER act randomly on individual cases but try to stick to the protocol. Evaluate and adapt the protocol or process after a year to see what can be improved.

The process needs to define:

• What is a safety event.
• How are safety events dealt with and by whom.
• How will judgment be formed about behaviour of the workforce (see also A Committee).
• What do we do with the results.
• Who will be responsible for the process.