System Surety

摘要

System surety is an essential part of an overall system engineering approach, particularly for the design and development of high-consequence systems. High-consequence systems are systems that are subject to catastrophic loss due to accidental or malevolent causes. Surety incorporates elements of reliability, safety, and security to define the level of confidence that a system will operate exactly as planned under both expected and unexpected circumstances. Surety assures reliability under normal operating circumstances, safety under off-normal circumstances, and security under malevolent or hostile circumstances. Surety provides an alternative to compliance-based philosophies for high-consequence systems, providing a robust systemic framework for understanding and solving issues associated with achieving desired levels of safety, security, and reliability. This paper will explain the system surety philosophy and approach. Examples from ancient Rome's water supply infrastructure will illustrate the system surety philosophy and approach.