The improvement of safety in operations in modern day industries relies to a significant extent on a good safety culture. The single most important part of a good safety culture has been recognised as Just Culture. This is an atmosphere of trust where employees feel naturally inspired to call to attention safety risks, even when they themselves may be implicated in the discovery of that safety risk. However it is also clear that unacceptable behaviour will not be tolerated. The six ATM partners for Just Culture (ATCEUC, CANSO, ETF, IFAIMA, IFATCA and IFATSEA) representing different actors of the organisational domain (employers, workers, professional staff organisations) have developed,as part of an EU-funded social dialogue project, a toolbox containing a set of guiding principles for developing and implementing a Just Culture in ATM.