Author: Nicholas J. Bahr
Publisher: CRC Press
ISBN: 1466551615
Category : Technology & Engineering
Languages : en
Pages : 436
Book Description
We all know that safety should be an integral part of the systems that we build and operate. The public demands that they are protected from accidents, yet industry and government do not always know how to reach this common goal. This book gives engineers and managers working in companies and governments around the world a pragmatic and reasonable approach to system safety and risk assessment techniques. It explains in easy-to-understand language how to design workable safety management systems and implement tested solutions immediately. The book is intended for working engineers who know that they need to build safe systems, but aren’t sure where to start. To make it easy to get started quickly, it includes numerous real-life engineering examples. The book’s many practical tips and best practices explain not only how to prevent accidents, but also how to build safety into systems at a sensible price. The book also includes numerous case studies from real disasters that describe what went wrong and the lessons learned. See What’s New in the Second Edition: New chapter on developing government safety oversight programs and regulations, including designing and setting up a new safety regulatory body, developing safety regulatory oversight functions and governance, developing safety regulations, and how to avoid common mistakes in government oversight Significantly expanded chapter on safety management systems, with many practical applications from around the world and information about designing and building robust safety management systems, auditing them, gaining internal support, and creating a safety culture New and expanded case studies and "Notes from Nick’s Files" (examples of practical applications from the author’s extensive experience) Increased international focus on world-leading practices from multiple industries with practical examples, common mistakes to avoid, and new thinking about how to build sustainable safety management systems New material on safety culture, developing leading safety performance indicators, safety maturity model, auditing safety management systems, and setting up a safety knowledge management system
System Safety Engineering and Risk Assessment
Author: Nicholas J. Bahr
Publisher: CRC Press
ISBN: 1466551615
Category : Technology & Engineering
Languages : en
Pages : 436
Book Description
We all know that safety should be an integral part of the systems that we build and operate. The public demands that they are protected from accidents, yet industry and government do not always know how to reach this common goal. This book gives engineers and managers working in companies and governments around the world a pragmatic and reasonable approach to system safety and risk assessment techniques. It explains in easy-to-understand language how to design workable safety management systems and implement tested solutions immediately. The book is intended for working engineers who know that they need to build safe systems, but aren’t sure where to start. To make it easy to get started quickly, it includes numerous real-life engineering examples. The book’s many practical tips and best practices explain not only how to prevent accidents, but also how to build safety into systems at a sensible price. The book also includes numerous case studies from real disasters that describe what went wrong and the lessons learned. See What’s New in the Second Edition: New chapter on developing government safety oversight programs and regulations, including designing and setting up a new safety regulatory body, developing safety regulatory oversight functions and governance, developing safety regulations, and how to avoid common mistakes in government oversight Significantly expanded chapter on safety management systems, with many practical applications from around the world and information about designing and building robust safety management systems, auditing them, gaining internal support, and creating a safety culture New and expanded case studies and "Notes from Nick’s Files" (examples of practical applications from the author’s extensive experience) Increased international focus on world-leading practices from multiple industries with practical examples, common mistakes to avoid, and new thinking about how to build sustainable safety management systems New material on safety culture, developing leading safety performance indicators, safety maturity model, auditing safety management systems, and setting up a safety knowledge management system
Publisher: CRC Press
ISBN: 1466551615
Category : Technology & Engineering
Languages : en
Pages : 436
Book Description
We all know that safety should be an integral part of the systems that we build and operate. The public demands that they are protected from accidents, yet industry and government do not always know how to reach this common goal. This book gives engineers and managers working in companies and governments around the world a pragmatic and reasonable approach to system safety and risk assessment techniques. It explains in easy-to-understand language how to design workable safety management systems and implement tested solutions immediately. The book is intended for working engineers who know that they need to build safe systems, but aren’t sure where to start. To make it easy to get started quickly, it includes numerous real-life engineering examples. The book’s many practical tips and best practices explain not only how to prevent accidents, but also how to build safety into systems at a sensible price. The book also includes numerous case studies from real disasters that describe what went wrong and the lessons learned. See What’s New in the Second Edition: New chapter on developing government safety oversight programs and regulations, including designing and setting up a new safety regulatory body, developing safety regulatory oversight functions and governance, developing safety regulations, and how to avoid common mistakes in government oversight Significantly expanded chapter on safety management systems, with many practical applications from around the world and information about designing and building robust safety management systems, auditing them, gaining internal support, and creating a safety culture New and expanded case studies and "Notes from Nick’s Files" (examples of practical applications from the author’s extensive experience) Increased international focus on world-leading practices from multiple industries with practical examples, common mistakes to avoid, and new thinking about how to build sustainable safety management systems New material on safety culture, developing leading safety performance indicators, safety maturity model, auditing safety management systems, and setting up a safety knowledge management system
Health and Safety: Risk Management
Author: Tony Boyle
Publisher: Routledge
ISBN: 0429790767
Category : Business & Economics
Languages : en
Pages : 774
Book Description
Health and Safety: Risk Management is the clearest and most comprehensive book on risk management available today. This newly revised fifth edition takes into account new developments in legislation, standards and good practice. ISO 45001, the international health and safety management system standard, is given comprehensive treatment, and the latest ISO 9004 and ISO 19011 have also been addressed. The book is divided into four main parts. Part 1.1 begins with a basic introduction to the techniques of health and safety risk management and continues with a description of ISO 45001. Part 1.2 covers basic human factors including how the sense organs work and the psychology of the individual. Part 2.1 deals with more advanced techniques of risk management including advanced incident investigation, audit and risk assessment, and Part 2.2 covers a range of advanced human factors topics including human error and decision making. This authoritative treatment of health and safety risk management is essential reading for both students working towards degrees, diplomas and postgraduate or vocational qualifications, and experienced health and safety professionals, who will find it invaluable as a reference.
Publisher: Routledge
ISBN: 0429790767
Category : Business & Economics
Languages : en
Pages : 774
Book Description
Health and Safety: Risk Management is the clearest and most comprehensive book on risk management available today. This newly revised fifth edition takes into account new developments in legislation, standards and good practice. ISO 45001, the international health and safety management system standard, is given comprehensive treatment, and the latest ISO 9004 and ISO 19011 have also been addressed. The book is divided into four main parts. Part 1.1 begins with a basic introduction to the techniques of health and safety risk management and continues with a description of ISO 45001. Part 1.2 covers basic human factors including how the sense organs work and the psychology of the individual. Part 2.1 deals with more advanced techniques of risk management including advanced incident investigation, audit and risk assessment, and Part 2.2 covers a range of advanced human factors topics including human error and decision making. This authoritative treatment of health and safety risk management is essential reading for both students working towards degrees, diplomas and postgraduate or vocational qualifications, and experienced health and safety professionals, who will find it invaluable as a reference.
Risk-based, Management-led, Audit-driven, Safety Management Systems
Author: Ron C. McKinnon
Publisher: CRC Press
ISBN: 1315394219
Category : Technology & Engineering
Languages : en
Pages : 267
Book Description
Risk-based, Management-led, Audit-driven, Safety Management Systems, explains what a safety management system (SMS) is, and how it reduces risk in order to prevent accidental losses in an organization. It advocates the integration of safety and health into the day-to-day management of the enterprise as a value, rather than an add-on, and emphasizes that the safety movement must be initiated, led and maintained by management at all levels. The concepts of safety authority, responsibility and accountability are described as the key ingredients to safety system success. Safety system audits are expounded in simple terms, and leading safety performance indicators are suggested as the most important measurements, in preference to lagging indicators. McKinnon highlights the importance of the identification and control of risk as a key basis for a SMS, with examples of a simple risk matrix and daily task risk assessment, as well as a simplified method of assessing, analyzing, and controlling risks. The book refers to international Guidelines on SMS, as well as the proposed International Organization for Standardization (ISO) 45001, which could soon become the international safety benchmark for organizations worldwide. Using clear, approachable examples, the chapters give a complete overview of an SMS and its components. Confirming to most of the safety management system Guidelines published by leading world authorities, this volume will allow organizations to structure their own world-class SMS.
Publisher: CRC Press
ISBN: 1315394219
Category : Technology & Engineering
Languages : en
Pages : 267
Book Description
Risk-based, Management-led, Audit-driven, Safety Management Systems, explains what a safety management system (SMS) is, and how it reduces risk in order to prevent accidental losses in an organization. It advocates the integration of safety and health into the day-to-day management of the enterprise as a value, rather than an add-on, and emphasizes that the safety movement must be initiated, led and maintained by management at all levels. The concepts of safety authority, responsibility and accountability are described as the key ingredients to safety system success. Safety system audits are expounded in simple terms, and leading safety performance indicators are suggested as the most important measurements, in preference to lagging indicators. McKinnon highlights the importance of the identification and control of risk as a key basis for a SMS, with examples of a simple risk matrix and daily task risk assessment, as well as a simplified method of assessing, analyzing, and controlling risks. The book refers to international Guidelines on SMS, as well as the proposed International Organization for Standardization (ISO) 45001, which could soon become the international safety benchmark for organizations worldwide. Using clear, approachable examples, the chapters give a complete overview of an SMS and its components. Confirming to most of the safety management system Guidelines published by leading world authorities, this volume will allow organizations to structure their own world-class SMS.
Process Risk and Reliability Management
Author: Ian Sutton
Publisher: Gulf Professional Publishing
ISBN: 9780128101650
Category : Business & Economics
Languages : en
Pages : 798
Book Description
In the last twenty years considerable progress has been made in process risk and reliability management, particularly in regard to regulatory compliance. Many companies are now looking to go beyond mere compliance; they are expanding their process safety management (PSM) programs to improve performance not just in safety, but also in environmental compliance, quality control and overall profitability. Techniques and principles are illustrated with numerous examples from chemical plants, refineries, transportation, pipelines and offshore oil and gas. This book helps executives, managers and technical professionals achieve not only their current PSM goals, but also to make the transition to a broader operational integrity strategy. The book focuses on the energy and process industries- from refineries, to pipelines, chemical plants, transportation, energy and offshore facilities. The techniques described in the book can also be applied to a wide range of non-process industries. The book is both thorough and practical. It discusses theoretical principles in a wide variety of areas such as management of change, risk analysis and incident investigation, and then goes on to show how these principles work in practice, either in the design office or in an operating facility. The second edition has been expanded, revised and updated and many new sections have been added including: The impact of resource limitations, a review of some recent major incidents, the value of story-telling as a means of conveying process safety values and principles, and the impact of the proposed changes to the OSHA PSM standard. Learn how to develop a thorough and complete process safety management program. Go beyond traditional hazards analysis and risk management programs to explore a company's entire range of procedures, processes and management issues. Understand how to develop a culture of process safety and operational excellence that goes beyond simple rule compliance. Develop process safety programs for both onshore facilities (EPA, OSHA) and offshore platforms and rigs (BSEE) and to meet Safety Case requirements.
Publisher: Gulf Professional Publishing
ISBN: 9780128101650
Category : Business & Economics
Languages : en
Pages : 798
Book Description
In the last twenty years considerable progress has been made in process risk and reliability management, particularly in regard to regulatory compliance. Many companies are now looking to go beyond mere compliance; they are expanding their process safety management (PSM) programs to improve performance not just in safety, but also in environmental compliance, quality control and overall profitability. Techniques and principles are illustrated with numerous examples from chemical plants, refineries, transportation, pipelines and offshore oil and gas. This book helps executives, managers and technical professionals achieve not only their current PSM goals, but also to make the transition to a broader operational integrity strategy. The book focuses on the energy and process industries- from refineries, to pipelines, chemical plants, transportation, energy and offshore facilities. The techniques described in the book can also be applied to a wide range of non-process industries. The book is both thorough and practical. It discusses theoretical principles in a wide variety of areas such as management of change, risk analysis and incident investigation, and then goes on to show how these principles work in practice, either in the design office or in an operating facility. The second edition has been expanded, revised and updated and many new sections have been added including: The impact of resource limitations, a review of some recent major incidents, the value of story-telling as a means of conveying process safety values and principles, and the impact of the proposed changes to the OSHA PSM standard. Learn how to develop a thorough and complete process safety management program. Go beyond traditional hazards analysis and risk management programs to explore a company's entire range of procedures, processes and management issues. Understand how to develop a culture of process safety and operational excellence that goes beyond simple rule compliance. Develop process safety programs for both onshore facilities (EPA, OSHA) and offshore platforms and rigs (BSEE) and to meet Safety Case requirements.
Handbook of System Safety and Security
Author: Edward Griffor
Publisher: Syngress
ISBN: 0128038381
Category : Computers
Languages : en
Pages : 301
Book Description
Handbook of System Safety and Security: Cyber Risk and Risk Management, Cyber Security, Adversary Modeling, Threat Analysis, Business of Safety, Functional Safety, Software Systems, and Cyber Physical Systems presents an update on the world's increasing adoption of computer-enabled products and the essential services they provide to our daily lives. The tailoring of these products and services to our personal preferences is expected and made possible by intelligence that is enabled by communication between them. Ensuring that the systems of these connected products operate safely, without creating hazards to us and those around us, is the focus of this book, which presents the central topics of current research and practice in systems safety and security as it relates to applications within transportation, energy, and the medical sciences. Each chapter is authored by one of the leading contributors to the current research and development on the topic. The perspective of this book is unique, as it takes the two topics, systems safety and systems security, as inextricably intertwined. Each is driven by concern about the hazards associated with a system's performance. - Presents the most current and leading edge research on system safety and security, featuring a panel of top experts in the field - Includes several research advancements published for the first time, including the use of 'goal structured notation' together with a 'judgment calculus' and their automation as a 'rule set' to facilitate systems safety and systems security process execution in compliance with existing standards - Presents for the first time the latest research in the field with the unique perspective that systems safety and systems security are inextricably intertwined - Includes coverage of systems architecture, cyber physical systems, tradeoffs between safety, security, and performance, as well as the current methodologies and technologies and implantation practices for system safety and security
Publisher: Syngress
ISBN: 0128038381
Category : Computers
Languages : en
Pages : 301
Book Description
Handbook of System Safety and Security: Cyber Risk and Risk Management, Cyber Security, Adversary Modeling, Threat Analysis, Business of Safety, Functional Safety, Software Systems, and Cyber Physical Systems presents an update on the world's increasing adoption of computer-enabled products and the essential services they provide to our daily lives. The tailoring of these products and services to our personal preferences is expected and made possible by intelligence that is enabled by communication between them. Ensuring that the systems of these connected products operate safely, without creating hazards to us and those around us, is the focus of this book, which presents the central topics of current research and practice in systems safety and security as it relates to applications within transportation, energy, and the medical sciences. Each chapter is authored by one of the leading contributors to the current research and development on the topic. The perspective of this book is unique, as it takes the two topics, systems safety and systems security, as inextricably intertwined. Each is driven by concern about the hazards associated with a system's performance. - Presents the most current and leading edge research on system safety and security, featuring a panel of top experts in the field - Includes several research advancements published for the first time, including the use of 'goal structured notation' together with a 'judgment calculus' and their automation as a 'rule set' to facilitate systems safety and systems security process execution in compliance with existing standards - Presents for the first time the latest research in the field with the unique perspective that systems safety and systems security are inextricably intertwined - Includes coverage of systems architecture, cyber physical systems, tradeoffs between safety, security, and performance, as well as the current methodologies and technologies and implantation practices for system safety and security
Bow Ties in Risk Management
Author: CCPS (Center for Chemical Process Safety)
Publisher: John Wiley & Sons
ISBN: 1119490391
Category : Technology & Engineering
Languages : en
Pages : 224
Book Description
AN AUTHORITATIVE GUIDE THAT EXPLAINS THE EFFECTIVENESS AND IMPLEMENTATION OF BOW TIE ANALYSIS, A QUALITATIVE RISK ASSESSMENT AND BARRIER MANAGEMENT METHODOLOGY From a collaborative effort of the Center for Chemical Process Safety (CCPS) and the Energy Institute (EI) comes an invaluable book that puts the focus on a specific qualitative risk management methodology – bow tie barrier analysis. The book contains practical advice for conducting an effective bow tie analysis and offers guidance for creating bow tie diagrams for process safety and risk management. Bow Ties in Risk Management clearly shows how bow tie analysis and diagrams fit into an overall process safety and risk management framework. Implementing the methods outlined in this book will improve the quality of bow tie analysis and bow tie diagrams across an organization and the industry. This important guide: Explains the proven concept of bow tie barrier analysis for the preventing and mitigation of incident pathways, especially related to major accidents Shows how to avoid common pitfalls and is filled with real-world examples Explains the practical application of the bow tie method throughout an organization Reveals how to treat human and organizational factors in a sound and practical manner Includes additional material available online Although this book is written primarily for anyone involved with or responsible for managing process safety risks, this book is applicable to anyone using bow tie risk management practices in other safety and environmental or Enterprise Risk Management applications. It is designed for a wide audience, from beginners with little to no background in barrier management, to experienced professionals who may already be familiar with bow ties, their elements, the methodology, and their relation to risk management. The missions of both the CCPS and EI include developing and disseminating knowledge, skills, and good practices to protect people, property and the environment by bringing the best knowledge and practices to industry, academia, governments and the public around the world through collective wisdom, tools, training and expertise. The CCPS has been at the forefront of documenting and sharing important process safety risk assessment methodologies for more than 30 years. The EI's Technical Work Program addresses the depth and breadth of the energy sector, from fuels and fuels distribution to health and safety, sustainability and the environment. The EI program provides cost-effective, value-adding knowledge on key current and future international issues affecting those in the energy sector.
Publisher: John Wiley & Sons
ISBN: 1119490391
Category : Technology & Engineering
Languages : en
Pages : 224
Book Description
AN AUTHORITATIVE GUIDE THAT EXPLAINS THE EFFECTIVENESS AND IMPLEMENTATION OF BOW TIE ANALYSIS, A QUALITATIVE RISK ASSESSMENT AND BARRIER MANAGEMENT METHODOLOGY From a collaborative effort of the Center for Chemical Process Safety (CCPS) and the Energy Institute (EI) comes an invaluable book that puts the focus on a specific qualitative risk management methodology – bow tie barrier analysis. The book contains practical advice for conducting an effective bow tie analysis and offers guidance for creating bow tie diagrams for process safety and risk management. Bow Ties in Risk Management clearly shows how bow tie analysis and diagrams fit into an overall process safety and risk management framework. Implementing the methods outlined in this book will improve the quality of bow tie analysis and bow tie diagrams across an organization and the industry. This important guide: Explains the proven concept of bow tie barrier analysis for the preventing and mitigation of incident pathways, especially related to major accidents Shows how to avoid common pitfalls and is filled with real-world examples Explains the practical application of the bow tie method throughout an organization Reveals how to treat human and organizational factors in a sound and practical manner Includes additional material available online Although this book is written primarily for anyone involved with or responsible for managing process safety risks, this book is applicable to anyone using bow tie risk management practices in other safety and environmental or Enterprise Risk Management applications. It is designed for a wide audience, from beginners with little to no background in barrier management, to experienced professionals who may already be familiar with bow ties, their elements, the methodology, and their relation to risk management. The missions of both the CCPS and EI include developing and disseminating knowledge, skills, and good practices to protect people, property and the environment by bringing the best knowledge and practices to industry, academia, governments and the public around the world through collective wisdom, tools, training and expertise. The CCPS has been at the forefront of documenting and sharing important process safety risk assessment methodologies for more than 30 years. The EI's Technical Work Program addresses the depth and breadth of the energy sector, from fuels and fuels distribution to health and safety, sustainability and the environment. The EI program provides cost-effective, value-adding knowledge on key current and future international issues affecting those in the energy sector.
Advances in Safety, Reliability and Risk Management
Author: Christophe Berenguer
Publisher: CRC Press
ISBN: 0203135105
Category : Technology & Engineering
Languages : en
Pages : 538
Book Description
Covering a wide range of topics on safety, reliability and risk management, the present publication will be of interest to academics and professionals working in a wide range of scientific, industrial and governmental sectors, including: Aeronautics and Aerospace; Chemical and Process Industry; Civil Engineering; Critical Infrastructures; Energy; Information Technology and Telecommunications; Land Transportation; Manufacturing; Maritime Transportation; Mechanical Engineering; Natural Hazards; Nuclear Industry; Offshore Industry; Policy Making and Public Planning.
Publisher: CRC Press
ISBN: 0203135105
Category : Technology & Engineering
Languages : en
Pages : 538
Book Description
Covering a wide range of topics on safety, reliability and risk management, the present publication will be of interest to academics and professionals working in a wide range of scientific, industrial and governmental sectors, including: Aeronautics and Aerospace; Chemical and Process Industry; Civil Engineering; Critical Infrastructures; Energy; Information Technology and Telecommunications; Land Transportation; Manufacturing; Maritime Transportation; Mechanical Engineering; Natural Hazards; Nuclear Industry; Offshore Industry; Policy Making and Public Planning.
Principles of Risk Management and Patient Safety
Author: Barbara J. Youngberg
Publisher: Jones & Bartlett Publishers
ISBN: 1449657893
Category : Medical
Languages : en
Pages : 519
Book Description
Principles of Risk Management and Patient Safety identifies changes in the industry and describes how these changes have influenced the functions of risk management in all aspects of healthcare. The book is divided into four sections. The first section describes the current state of the healthcare industry and looks at the importance of risk management and the emergence of patient safety. It also explores the importance of working with other sectors of the health care industry such as the pharmaceutical and device manufacturers. Important Notice: The digital edition of this book is missing some of the images or content found in the physical edition.
Publisher: Jones & Bartlett Publishers
ISBN: 1449657893
Category : Medical
Languages : en
Pages : 519
Book Description
Principles of Risk Management and Patient Safety identifies changes in the industry and describes how these changes have influenced the functions of risk management in all aspects of healthcare. The book is divided into four sections. The first section describes the current state of the healthcare industry and looks at the importance of risk management and the emergence of patient safety. It also explores the importance of working with other sectors of the health care industry such as the pharmaceutical and device manufacturers. Important Notice: The digital edition of this book is missing some of the images or content found in the physical edition.
Guidelines for Risk Based Process Safety
Author: CCPS (Center for Chemical Process Safety)
Publisher: John Wiley & Sons
ISBN: 111820963X
Category : Technology & Engineering
Languages : en
Pages : 761
Book Description
Guidelines for Risk Based Process Safety provides guidelines for industries that manufacture, consume, or handle chemicals, by focusing on new ways to design, correct, or improve process safety management practices. This new framework for thinking about process safety builds upon the original process safety management ideas published in the early 1990s, integrates industry lessons learned over the intervening years, utilizes applicable "total quality" principles (i.e., plan, do, check, act), and organizes it in a way that will be useful to all organizations - even those with relatively lower hazard activities - throughout the life-cycle of a company.
Publisher: John Wiley & Sons
ISBN: 111820963X
Category : Technology & Engineering
Languages : en
Pages : 761
Book Description
Guidelines for Risk Based Process Safety provides guidelines for industries that manufacture, consume, or handle chemicals, by focusing on new ways to design, correct, or improve process safety management practices. This new framework for thinking about process safety builds upon the original process safety management ideas published in the early 1990s, integrates industry lessons learned over the intervening years, utilizes applicable "total quality" principles (i.e., plan, do, check, act), and organizes it in a way that will be useful to all organizations - even those with relatively lower hazard activities - throughout the life-cycle of a company.
Aviation System Risks and Safety
Author: Kuklev E.A.
Publisher: Springer
ISBN: 9811381224
Category : Technology & Engineering
Languages : en
Pages : 186
Book Description
This book provides a solution to “rare event” problems without using the classical theory of reliability and theory of probability. This solution is based on the methodology of risk assessment as “measure of danger” (in keeping with the ICS RAS) and an expert approach to determining systems’ safety indications using Fuzzy Sets methods. Further, the book puts forward a new concept: “Reliability, Risks, and Safety” (RRS). The book’s main goal is to generalize present results and underscore the need to develop an alternative approach to safety level assessment and risk management for technical (aviation) systems in terms of Fuzzy Sets objects, in addition to traditional probabilistic safety analysis (PSA). The concept it proposes incorporates ICAO recommendations regarding proactive system control and the system’s responses to various internal and external disturbances.
Publisher: Springer
ISBN: 9811381224
Category : Technology & Engineering
Languages : en
Pages : 186
Book Description
This book provides a solution to “rare event” problems without using the classical theory of reliability and theory of probability. This solution is based on the methodology of risk assessment as “measure of danger” (in keeping with the ICS RAS) and an expert approach to determining systems’ safety indications using Fuzzy Sets methods. Further, the book puts forward a new concept: “Reliability, Risks, and Safety” (RRS). The book’s main goal is to generalize present results and underscore the need to develop an alternative approach to safety level assessment and risk management for technical (aviation) systems in terms of Fuzzy Sets objects, in addition to traditional probabilistic safety analysis (PSA). The concept it proposes incorporates ICAO recommendations regarding proactive system control and the system’s responses to various internal and external disturbances.