Lt. Kermit Tyler was warned of the approach of a large flight of aircraft toward Pearl Harbour. The radar operators were tracking Japanese planes coming to attack the base, but the operator failed to make clear the size of the formation and Tyler did not pass on an alarm of "attack imminent”. In the case of the “9/11” attack on New York’s Twin Towers, the intelligence agencies did not share relevant information. These problems, and many more like them, are caused by a lack of planning of the safety-related communication network in advance. There is a need to plan horizontal protocols to communicate with other organisations and vertical protocols to communicate effectively within organisations. The Layered Enterprise Data Safety Model (LEDSM) is a way to develop safer networks of communication of any type, verbal, telephone, internet, etc., or a mix of types, so that the risks of failures to communicate are considerably reduced. The initial idea is taken from the Open Systems Interface. This paper takes the reader from initial concepts through ten sections of increasing learning. These sections show how, even with increasing complexity, the principles involved provide increased confidence that risks are minimised. Worked examples are provided to increase insights into the numerous possible applications.