Risk Terminology and Events

This chapter provides a comprehensive foundation in risk-related terminology and core concepts essential for consistent communication and analysis. It defines systems, events, scenarios, hazards, threats, performance measures, probabilities, and reliability in a unified framework. The chapter clarifies distinctions among uncertainty, ignorance, exposure, consequences, and contingency, and formally defines risk in engineering, finance, banking and economic contexts. Key concepts in risk assessment, including qualitative and quantitative approaches, are introduced along with risk-based technologies and methodologies. The chapter further explores risk events and contributing factors, including root causes, precursor events, time-dependent risks, and human-related risks such as errors and deliberate threats. Political, economic, financial, and operational risks are also discussed. By establishing a precise and structured vocabulary, this chapter lays the groundwork for rigorous risk modeling, assessment, and management in subsequent chapters.