1 CATEGORY A ATTRIBUTES
1.1 Preventive risk control is where the risk control measure reduces the
probability of the event.
1.2 Mitigating risk control is where the risk control measure reduces the
severity of the outcome of the event or subsequent events, should they occur.
2 CATEGORY B ATTRIBUTES
2.1 Engineering risk control involves including safety features (either built in
or added on) within a design. Such safety features are safety critical when the absence
of the safety feature would result in an unacceptable level of risk.
2.2 Inherent risk control is where at the highest conceptual level in the design
process, choices are made that restrict the level of potential risk.
2.3 Procedural risk control is where the operators are relied upon to control the
risk by behaving in accordance with defined procedures.
3 CATEGORY C ATTRIBUTES
3.1 Diverse risk control is where the control is distributed in different ways
across aspects of the system, whereas concentrated risk control is where the risk
control is similar across aspects of the system.
3.2 Redundant risk control is where the risk control is robust to failure of risk
control, whereas single risk control is where the risk control is vulnerable to
failure of risk control.
3.3 Passive risk control is where there is no action required to deliver the risk
control measure, whereas active risk control is where the risk control is
provided by the action of safety equipment or operators.
3.4 Independent risk control is where the risk control measure has no influence
on other elements.
3.5 Dependent risk control is where one risk control measure can influence
another element of the risk contribution tree.
3.6 Involved human factors is where human action is required to control the risk
but where failure of the human action will not in itself cause an accident or allow an
accident sequence to progress.
3.7 Critical human factors is where human action is vital to control the risk
either where failure of the human action will directly cause an accident or will allow
an accident sequence to progress. Where a critical human factor attribute is
assigned, the human action (or critical task) should be clearly defined in the risk
control measure.
3.8 Auditable or Not Auditable reflects whether the risk control measure
can be audited or not.
3.9 Quantitative or Qualitative reflects whether the risk control measure
has been based on a quantitative or qualitative assessment of risk.
3.10 Established or Novel reflects whether the risk control measure is an
extension to existing marine technology or operations, whereas novel is where the
measure is new. Different grades are possible, for example the measure may be novel to
shipping but established in other industries or it is novel to both shipping and other
industries.
3.11 Developed or Non-developed reflects whether the technology underlying
the risk control measure is developed both in its technical effectiveness and its basic
cost. Non-developed is either where the technology is not developed but it can be
reasonably expected to develop, or its basic cost can be expected to reduce in a given
timescale. The purpose of considering this attribute is to attempt to anticipate
development and produce forward looking measures and options.