Design safety precept

An OSP is a safety precept that that is directed at the operational phase. These precepts are operational safety rules that must be adhered to during system operation. One aspect of OSPs is that they may directly spawn the need for DSPs that will help realize the OSP via design methods. Although the development PM has no influence during system operation, the OSPs will provide guidance for many design features that will need to be implemented in order to meet the OSPs. An example OSP might be The unmanned system shall be considered unsafe until a safe state can be verified. ... 

Safety precepts should meet the following criteria, as a minimum, in order to be valuable and effective for system designers ... 

Safety precepts must provide value in the guidance they provide. K they do not help the safety or the design organizations, then they are of no worth to the program. 

Safety precepts must provide general safety guidance or safety objectives. The goal is to provide a general focus and direction on a particular safety issue, not a detailed design requirement. 

The objective of system safety is to develop a system that provides acceptable minimum mishap risk. The basic system safety philosophy for achieving this goal is to confront hazards, mishaps, and risk at three different levels of safety defense. These levels of defense are engineered into the system design. This layer of protection philosophy is summarized by the following three safety precepts ... 

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