Safety

Safety is the state of being protected from harm or danger. It also refers to the control of recognized hazards to reach an acceptable level of risk. While many people assume the meaning of safety is universal, there is no single definition that everyone accepts. Definitions often depend on community understanding and different perspectives. Some experts define it as the absence of risk or adverse incidents. Others view it as the capability to defend against bad events and lessen their effects.

Researchers and organizations offer many ways to describe this concept. For example, the Oxford English Dictionary defines it as freedom from danger and risks. The Merriam-Webster Dictionary describes it as being safe from causing or undergoing injury or loss. Some professionals see safety as the ability of a system to perform its purpose without harming people. Others describe it as the preservation of positive value. In many settings, safety is seen as a "steady state" where a place or organization does what it is supposed to do. This involves following public codes, engineering designs, and operational plans.

To understand safety, one must understand its relationship to risk. Risk is the chance that something bad might happen. The level of safety is often linked to the level of risk. High safety generally means low risk, while low safety means high risk. However, safety is often relative rather than absolute. Eliminating all risk is extremely difficult and can be very expensive. A safe situation is usually one where risks are low and manageable.

Experts categorize safety into three distinct types: normative, substantive, and perceived. Normative safety occurs when a product or design meets official standards and practices. Substantive safety, also called objective safety, happens when a product has a favorable real-world safety history. Perceived safety refers to how comfortable a person feels, regardless of actual facts.

These three can sometimes conflict. For instance, a traffic roundabout might have a good safety record, but drivers may perceive it as unsafe. Conversely, people might feel safe driving a car even though flying is statistically safer.

Safety can also be divided into security and operational safety. Security, or public safety, addresses risks from intentional criminal acts like burglary or vandalism. Many people consider security to be of higher importance due to the moral nature of these acts. Operational safety refers to maintaining an acceptable level of risk within a working system. This involves identifying hazards, assessing risks, and implementing mitigation measures to protect life, property, and the environment.

Engineering plays a massive role in managing these complex systems. System safety and reliability engineering is a specific discipline used to analyze critical systems. This field is constantly changing due to new technology and environmental regulations. Engineers must study literature, standards, and past practices to be effective. They often work alongside other disciplines like quality, reliability, availability, and maintainability. These factors help determine the overall value of a project or organization.

In response to perceived risks, people use various interventions. Engineering responses and government regulations are two of the most common methods. On an individual level, insurance is a very common response to safety concerns. Insurance provides compensation or restitution in the event of loss or damage. By combining these methods, societies attempt to manage the many different types of hazards that exist in the modern world.