Risk Assessment

ABRM Analytic Blunder Risk Model
The ABRM estimates the collision risk inherent in a reported (or hypothetical) air traffic controller error or pilot deviation. While some other tools predict the probability of an error occurring, AB . (Read Complete Description)
AT (symbol) Risk
@Risk is an add-in for Microsoft Excel. It uses the techniques of Monte Carlo simulation to assess the impacts of risk decisions and determining all possible outcomes to a model for risk analysis. The . (Read Complete Description)
Barrier Analysis
Barrier analysis is a structured way to consider the events related to a system failure. Developed for the Department of Energy under the Management Oversight and Risk Tree (MORT) program (Johnson 198 . (Read Complete Description)
Bow - Tie Analysis
The Bow-Tie Diagram is a structured approach to risk analysis within safety cases where quantification is not possible or desirable. It has evolved over the past decades from the Cause Consequence Dia . (Read Complete Description)
Change Analysis
The Change analysis is intended to analyze the hazard implications of either planned or incremental changes. It was used by the US Air Force in the early 1960s. As with barrier analysis, the principle . (Read Complete Description)
Continuous Safety Sampling Methodology (CSSM)
CSSM provides an analysis of the system using the Preliminary Hazard Analysis (PHA), which includes direct observation and sampling techniques. Sampling is performed to observe the occurrence of condi . (Read Complete Description)
Cooperative Evaluation
Cooperative evaluation is a similar to the think aloud protocol used to identify usability problems in prototype products and processes. The technique encourages design teams and users to collaborate . (Read Complete Description)
Event Tree Analysis
An event tree is a pictorial representation of all the events which can occur in a system. The initiating event is the root of the event tree. Lines are drawn from the root, depicting the positive and . (Read Complete Description)
Expert Judgments
Procedure: 1) Decision about which method will be used for assessing expert judgments: Absolute Probability Judgments (APJ) or Paired Comparisons (PC) 2) Decision about process of judgment assessment . (Read Complete Description)
Failure Modes and Effects Analysis
FMEA is designed to evaluate the impact of system components failure. The focus of the FMEA is on how such a failure could occur (failure mode) and the impact of such a failure (effects). FMEA can be . (Read Complete Description)
Fault Tree Analysis
FTA is a failure analysis technique. It involves examining preceding events leading up to a system failure. The tree starts with the accident event and, working backwards through time, breaks it down . (Read Complete Description)
FaultrEASE software was developed to create, edit, and draw fault trees with minimal effort. It performs elementary fault tree mathematics, including mixed probability and frequency calculations, Bool . (Read Complete Description)
Function Flow Diagram
Functional flow diagrams display the sequence and arrangement of functions within a system. The plots or flow of activities and information exchange are plotted in time sequence similar to the informa . (Read Complete Description)
Hazard and Operability Analysis (HAZOP)
The HAZOP technique was developed to identify operability problems during the design stage of a plant. It uses a structured, systematic brainstorming approach with an interdisciplinary team to identif . (Read Complete Description)
Human Reliability Event Tree Analysis
An event tree is a pictorial representation of errors which can occur in a system. Human errors, identified through task analysis, can be depicted in the form of event trees. The initiating event is t . (Read Complete Description)
Interface Analysis
An interface analysis is similar to a barrier analysis or change analysis. It is intended to uncover the hazardous linkages or interfaces between seemingly unrelated activities. The interface analysis . (Read Complete Description)
Job Hazard Analysis (JHA)
The purpose of the Job Hazard Analysis (JHA) is to examine in detail the safety considerations of a single job. A variation of the JHA called a task analysis focuses on a single task, i.e., some small . (Read Complete Description)
Logic Diagram
The logic diagram is intended to provide the maximum structure and detail among the primary hazard ID procedures. Its graphic structure is an excellent means of capturing and correlating the hazard da . (Read Complete Description)
Management Oversight Risk Tree (MORT)
MORT was developed by William Johnson under the auspices of the U.S. Atomic Energy Commission. MORT is a comprehensive, analytical, disciplined method for determining the causes and contributing facto . (Read Complete Description)
Markov Latent Effects Tool for Organizational and Operational Safety Assessment
The Markov latent effects approach is named in honor of A. A. Markov, who was one of the first scientists to formalize the mathematical role of a chain of occurrences in determining subsequent events. . (Read Complete Description)
Multiattribute Utility Theory
Multiattribute utility theory is an axiomatized mathematical framework for analyzing choices involving multiple competing outcomes. It is used to quantify concepts like safety, quality of life, and ae . (Read Complete Description)
Multilinear Events Sequencing Technology (MES)
The Multilinear Events Sequencing technology is an integrated body of concepts and procedures for investigating and analyzing a wide range of desired and undesired processes before or after they happe . (Read Complete Description)
Pareto Chart
The Pareto chart is a specialized version of a histogram that ranks the categories in the chart from most frequent to least frequent. A Pareto Chart is useful for non-numeric data, such as "cause", "t . (Read Complete Description)
Preliminary Hazard Analysis
A design tool that helps identify and handle hazards in the early stages of design. . (Read Complete Description)
Probabilistic Risk Assessment (PRA)
Probabilistic risk assessment is an integration of failure modes and effects analysis (FMEA), fault tree analysis, and other techniques to assess the potential for failure and to help find ways to red . (Read Complete Description)
Reduced Aircraft Separation Risk Analysis Model
RASRAM (a registered trademark of Rannoch Corporation) is a PC-based tool that is based on a large database of aircraft data, incorporating aircraft and air traffic controller data. It was developed u . (Read Complete Description)
Relex Human Factors Risk Analysis
Relex Human Factors Risk Analysis provides a complete systematic means for assessing human errors in any process. It is based on Process Failure Mode and Effects Analysis (PFMEA), consequently it is a . (Read Complete Description)
Safety and Risk Evaluation using Bayesian Nets (SERENE)
SERENE is a tool for quantifying the safety of a complex system using Bayesian Networks. SERENE method is concerned with the functional safety of complex systems. Functional safety is the ability of a . (Read Complete Description)
Scenario Process Tool
The Scenario Process tool is a time-tested procedure to identify hazards by visualizing them. This is often described as constructing a “mental movie”. It is designed to capture the intuitive and exp . (Read Complete Description)
Subjective Expected Utility (SEU)
SEU theory is one method to transform concepts like safety, quality of life, and aesthetic value into a form that can be used for cost/benefit analyses. The likelihood of an event (which is subject to . (Read Complete Description)
Table Top Analysis
The table top analysis is a team approach to solving program or performance related problems which can also be used in the analysis and design of a training topic or program. While the traditional nee . (Read Complete Description)
The TapRooT® System provides a methodology to lead an investigator through the techniques/steps used to perform an in-depth investigation of an incident's root causes or an in-depth audit or observati . (Read Complete Description)
Technique Of Operations Review (TOR)
TOR analysis was initially developed by Weaver (1973) as a training tool to assist with the prevention of incidents. It has subsequently found application as an investigatory technique for the identif . (Read Complete Description)
Technique to Estimate Operator’s Errors (TESEO)
TESEO derives estimates of the likelihood of operator failure through the combined application of five error likelihood parameters, namely, the type of activity, the degree of time stress involved in . (Read Complete Description)
The "What If" Tool
In a ‘What If’ hazard analysis, brainstorming techniques, in the form of ‘What If’ questions are used to identify possible deviations and weaknesses in design. Once identified, these concerns and thei . (Read Complete Description)
Traffic Organization and Perturbation AnalyZer (TOPAZ)
TOPAZ is a safety assessment methodology and tool set for evaluation of existing or newly developed ATM operational concepts. TOPAZ accounts for both the nominal and non-nominal events and dynamics of . (Read Complete Description)
WinNUPRA is a software package for performing probabilistic risk/safety assessments (PRAs/PSAs). This system, which consists of five major analysis modules, is designed to generate and analyze minimal . (Read Complete Description)