Human Error Analysis Software
Contents |
The Human Factors Workbench (HFW) software suite is an integrated set of human factors tools designed to support a wide range of analyses that are typically carried out in safety critical systems in
Human Error Analysis (hea)
the healthcare, chemical processing, aviation, power generation and other industries. These tools have human error analysis ppt been applied extensively in many projects over the past 15 years and have been shown to make substantial contributions
What Is Human Error Analysis
to safety and efficiency. By providing an integrated software environment, the HFW allows analysts to combine the results of a number of techniques when carrying out an overall analysis. Click here to human error analysis examples go to a technical paper that describes the functions available in the HFW in more detail The following tools are provided by modules in the HFW: 1. Risk Ranking This tool allows the analyst to carry out a simple and rapid evaluation of the areas where human errors will have the most severe consequences. This screening analysis can be applied to prioritise which human error analysis definition tasks or subtasks should be addressed first when embarking upon an analysis. The Risk Ranking module develops a Risk Ranking Index based on the likelihood of error and severity of consequences. The Risk Ranking Index can also include the likelihood of error recovery or consequence mitigation. A graphical risk matrix allows the risk ranking Index to be applied directly to any box in the Hierarchical Task Analysis (see below). 2. Human Factors Risk Analysis This module provides all the tools necessary for conducting the human factors risk assessments required by many regulatory authorities (e.g. the COMAH Safety Cases required by the Health and safety Executive in the UK).Hierarchical Task Analysis (HTA) is a method for systematically documenting tasks to provide a basis for the development of training, procedures and risk assessments. HTA breaks tasks down into a graphical representation of overall task goal, subtasks and the steps within these subtasks to the level of detail required for the application. This can then be converted to a table, suitable as the starting point for procedures, training development and the risk analyses performed by the Predictive Human Error Analysis (PHEA)
are attributed to a poorly designed human-computer interface (HCI). However, human beings are often needed to be the fail-safe in an otherwise automated system. Even the most highly trained and alert operators are prone to boredom when they are usually not needed
Human Error Analysis Pdf
for normal operation, and panic when an unusual situation occurs, stress levels are raised, and human error analysis and reduction technique lives are at stake. The HCI must give appropriate feedback to the operator to allow him or her to make well informed
Human Error Analysis Tools
decisions based on the most up to date information on the state of the system. High false alarm rates will make the operator ignore a real alarm condition. Methods for determining the effectiveness of an HCI, such http://www.humanreliability.com/services3.html as heuristic evaluation, cognitive walkthroughs, and empirical evaluations like protocol analysis, exist, but are often cumbersome and do not provide conclusive data on the safety and usability of an HCI. System designers must insure that the HCI is easy and intuitive for human operators to use, but not so simple that it lulls the operator into a state of complacency and lowers his or her responsiveness to emergency situations. Contents: Introduction Key Concepts Sources of https://users.ece.cmu.edu/~koopman/des_s99/human/ Human Error HCI Problems Available tools, techniques, and metrics HCI Design Heuristic Evaluation Cognitive Walkthrough Protocol Analysis MetriStation Relationship to other topics Conclusions Annotated Reference List & Further Reading Introduction In any complex system, most errors and failures in the system can be traced to a human source. Incomplete specifications, design defects, and implementation errors such as software bugs and manufacturing defects, are all caused by human beings making mistakes. However, when looking at human errors in the context of embedded systems, we tend to focus on operator errors and errors caused by a poor human-computer interface (HCI). Human beings have common failure modes and certain conditions will make it more likely for a human operator to make a mistake. A good HCI design can encourage the operator to perform correctly and protect the system from common operator errors. However, there is no well defined procedure for constructing an HCI for safety critical systems. In an embedded system, cost, size, power, and complexity are especially limited, so the interface must be relatively simple and easy to use without sacrificing system safety. Also, a distinction must be made between highly domain specific interfaces, like nuclear power controls or airplane pilot controls, and more general "walk up and use" interfaces, like automated teller machines or VCR onscreen menus [Maxion95]. However, this is not a hard
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