GWO BST key terms

A source or situation with potential to cause harm, considered separately from the likelihood and consequences of a particular exposure.

A structured examination of what can go wrong, who can be affected and how existing or proposed controls change the outcome.

A connection by which an agent can move from a source to a person or other receptor under defined conditions.

Removing a hazard or the need for the hazardous activity rather than relying only on behavior during the task.

Replacing a material or process with another option while assessing the new option for its own hazards and limitations.

A physical or technical measure intended to reduce exposure or prevent a hazardous event through the design of work.

A planned work arrangement, instruction or scheduling measure that depends on implementation and does not physically remove every hazard.

Equipment selected to reduce specified exposure or injury risks within an appropriate assessment, maintenance and use process.

Risk remaining after selected controls are considered under the conditions and assumptions required for their effectiveness.

A condition capable of defeating more than one nominal barrier, limiting the claim that those protections are independent.

An event without the reported injury or loss outcome that can nevertheless reveal a credible hazard or failed barrier.

Shared assumptions and behavior concerning safety that should be examined through actual decisions, reporting and control performance.

An average calculated by weighting concentrations or other measurements by their corresponding durations over a defined period.

A method capability relevant to interpreting a reported result, not proof that every unreported substance is absent.

A sample intended to represent air near the worker respiratory intake over the stated method and sampling period.

A component intended to capture particles within its approved performance, without automatically removing gases or supplying oxygen.

An assessed process for removing or reducing contamination while preventing transfer to people, clean areas or other equipment.

Measures intended to limit migration of contamination or a hazardous condition within a defined and managed work area.

A specified post-work acceptance process whose methods, roles and criteria depend on the applicable project and governing program.

Examination of an event and the conditions behind it to identify effective corrective action rather than only assign personal blame.

An evaluation of whether a particular tight-fitting respirator model and size provides an appropriate seal on the wearer.

Demonstrated ability to perform a defined task under the relevant conditions, rather than attendance at a learning activity alone.

An arrangement defining communication, roles and appropriate actions for foreseeable emergencies within the actual site and resources.

Evaluation of a handling task considering the load, activity, person, environment and ways to reduce the need for hazardous movement.

Checking that an intended protective measure is present, suitable and effective under the actual conditions of the task.