In this book the author applies contemporary error theory to the needs of investigators and of anyone attempting to understand why someone made a critical error, how that error led to an incident or accident, and how to prevent such errors in the future. Students and investigators of human error will gain an appreciation of the literature on error, with numerous references to both scientific research and investigative reports in a wide variety of applications, from airplane accidents, to bus accidents, to bonfire disasters. Based on the author's extensive experience as an accident investigator and instructor of both aircraft accident investigation techniques and human factors psychology, it reviews recent human factors literature, summarizes major transportation accidents, and shows how to investigate the types of errors that typically occur in high risk industries. It presents a model of human error causation influenced largely by James Reason and Neville Moray, and relates it to error investigations with step-by-step guidelines for data collection and analysis that investigators can readily apply as needed. This second edition of Investigating Human Error has been brought up to date throughout, with pertinent recent accidents and safety literature integrated. It features new material on fatigue, distraction (eg mobile phone and texting) and medication use. It also now explores the topics of corporate culture, safety culture and safety management systems. Additionally the second edition considers the effects of the reduction in the number of major accidents on investigation quality, the consequences of social changes on transportation safety (such as drinking and driving, cell phone use, etc), the contemporary role of accident investigation, and the effects of the prosecution of those involved in accidents.

The safety case and its associated reports are quickly becoming not only a mechanism for achieving safety goals, but also a valuable decision-support asset, and a vital industrial liability management tool. Recent developments in industry have led to safety cases being frequently required as contractual deliverables as part of large and complex commercial programmes. A safety case consists of a rational argument and detailed evidence to justify and demonstrate that a system or product is tolerably safe in its use, and that it has a management programme to ensure that this remains so. The safety case report is the snap-shot presentation of the arguments and evidence demonstrating the contemporary safety performance of the system and the programme that is in place. This book, written from personal experience and reference, provides a concentrated source document for assessing and constructing safety cases and safety case reports - from understanding their purposes, through their development and on to their presentation.

An easily accessible guide to scientific information, Hazardous Chemicals: Safety Management and Global Regulations covers proper management, precautions, and related global regulations on the safety management of chemical substances. The book helps workers and safety personnel prevent and minimize the consequences of catastrophic releases of toxic, reactive, flammable, or explosive chemical substances, which often result in toxic or explosive hazards. It also details safety measures for transportation of chemical substances by different routes, such as by road, rail, air, and sea. Discusses different aspects of potentially toxic and hazardous chemicals in simple and comprehensive language Provides toxicity and health effects of chemicals in simple, nontechnical language Covers scientific information on hazardous and potentially dangerous chemical substances at workplaces Offers fundamental knowledge about the biological and health effects of hazardous and potentially toxic chemicals in a comprehensive way Includes recent developments on safety management of hazardous and potentially toxic chemicals and related global regulations The author discusses the importance of knowledge in avoiding negligence during the use and handling of hazardous chemical substances. He stresses the importance of proper management and judicious application of each chemical substance irrespective of the workplace and eventually shows how safety and protection of the user, workplace, and the living environment can be achieved.

Risk is everywhere, in everything we do. Realizing this fact, we all must try to understand this "risk" and if possible to minimize it. This book expands the conversation beyond failure mode and effects analysis (FMEA) techniques. While FMEA is indeed a powerful tool to forecast failures for both design and processes, it is missing methods for considering safety issues, catastrophic events, and their consequences. Focusing on risk, safety, and HAZOP as they relate to major catastrophic events, Introduction to Risk and Failures: Tools and Methodologies addresses the process and implementation as well as understanding the fundamentals of using a risk methodology in a given organization for evaluating major safety and/or catastrophic problems. The book identifies and evaluates five perspectives through which risk and uncertainty can be viewed and analyzed: individual and societal concerns, complexity in government regulations, patterns of employment, and polarization of approaches between large and small organizations. In addition to explaining what risk is and exploring how it should be understood, the author makes a distinction between risk and uncertainty. He elucidates more than 20 specific methodologies and/or tools to evaluate risk in a manner that is practical and proactive but not heavy on theory. He also includes samples of checklists and demonstrates the flow of analysis for any type of hazard. Written by an expert with more than 30 years of experience, the book provides from-the-trenches examples that demonstrate the theory in action. It introduces methodologies such as ETA, FTA, and others which traditionally have been used specifically in reliability endeavors and details how they can be used in risk assessment. Highly practical, it shows you how to minimize or eliminate risks and failures for any given project or in any given work environment.

This is the first available edited collection of chapters on human performance in general aviation. Each chapter has been written by someone with knowledge of both the research literature and the operational background of general aviation. Chapters are designed to survey the current state of knowledge in areas critical to general aviation and to spell out both the operational implications of this knowledge and the directions needed for future research. Topics covered include strategies for flight instruction; the development of computer-based training; stress and decision making; skill development; the involvement of general aviation pilots in incidents and accidents; human factors implications of GPS use and the future of aircraft design and development in general aviation. The book provides an authoritative outline of currently applicable human factors knowledge for general aviation and a valuable guide to future developments. It features a foreword by Dr Stan Roscoe.

This edited book concerns the real practice of human factors and ergonomics (HF/E), conveying the perspectives and experiences of practitioners and other stakeholders in a variety of industrial sectors, organisational settings and working contexts. The book blends literature on the nature of practice with diverse and eclectic reflections from experience in a range of contexts, from healthcare to agriculture. It explores what helps and what hinders the achievement of the core goals of HF/E: improved system performance and human wellbeing. The book should be of interest to current HF/E practitioners, future HF/E practitioners, allied practitioners, HF/E advocates and ambassadors, researchers, policy makers and regulators, and clients of HF/E services and products.

Patient Safety: Perspectives on Evidence, Information and Knowledge Transfer provides background on the patient safety movement, systems safety, human error and other key philosophies that support change and innovation in the reduction of medical error. The book draws from multidisciplinary areas within the acute care environment to share models that support the proactive changes necessary to provide safe care delivery. The publication discusses how the tenets of safety (described in the beginning of the book) can be actively applied in the field to make evidence, information and knowledge (EIK) sharing processes reliable, effective and safe. This is a wide-ranging and important book that is designed to raise awareness of the latent risks for patient safety that are present in the EIK identification, acquisition and distribution processes, structures, and systems of many healthcare institutions across the world. The expert contributors offer systemic, evidence-based improvement processes, assessment concepts and innovative activities to identify these risks to minimize their potential to adversely impact care. These ideas are presented to create opportunities for the field to design and use strategies that enable meaningful implementation and management of EIK. Their thoughts will enable healthcare staff to see EIK as a tangible element contributing toward sustainable patient safety improvements.

Supplying a breadth and depth of coverage beyond that found in most traditional texts, Introduction to Human Factors and Ergonomics for Engineers, Second Edition presents and integrates important methods and tools used in the fields of Industrial Engineering, Human Factors and Ergonomics to design and improve jobs, tasks and products. It presents these topics with a practical, applied orientation suitable for engineering undergraduate students.

See What s New in the Second Edition:

• Revised order of chapters to group together topics related to the physical and cognitive aspects of human-integrated systems
• Substantially updated material emphasizes the design of products people work with, tasks or jobs people perform, and environments in which people live

The book has sufficient material to be used in its entirety for a two semester sequence of classes, or in part for a single semester course, focusing on selected topics covered in the text. The authors provide a set of guidelines and principles for the design and analysis of human-integrated systems and highlights their application to industry and service systems. It addresses the topics of human factors, work measurement and methods improvement, and product design an approachable style. The common thread throughout the book is on how better "human factors" can lead to improved safety, comfort, enjoyment, acceptance, and effectiveness in all application arenas. Packed with cases studies and examples, readers can use well beyond the classroom and into their professional lives.

- one of the first books to focus on the role of AI in and for Africa - tackles a wide range of issues including algorithmic bias and regulation - includes cross-disciplinary expertise from both the humanities and sciences

The field of sports ergonomics is now recognised as an interdisciplinary area in its own right. This book forms the proceedings of the 3rd International Conference on Sport, Leisure and Ergonomics, providing a particular focus on disabled athletes, health and fitness educations and sports equipment.

Written by experts with real-world experience in applying ergonomics methodology in a range of contexts, Evaluation of Human Work, Fourth Edition explores ergonomics and human factors from a "doing it" perspective. More than a cookbook of ergonomics methods, the book encourages students to think about which methods they should apply, when, and why. Now in its fourth edition, the editors have again brought together a team of world-renowned experts and created a forum for them to discuss and debate their most valued approaches. See What's New in the Fourth Edition: Significant change of authorship and content in each chapter Five new chapters covering inclusive design, situation awareness, neuroergonomics, ergonomics and quality, and standards in ergonomics design and evaluation Discussion of the idea of reflective practice and Ergonomics/Human Factors Examination of the systems perspective now prevalent in the field Coverage of new tools and the relationship between these physiologically measured parameters and theoretical concepts such as workload, fatigue, stress, or effort In addition to being a foundational text, the book is an authoritative reference for practising ergonomists. Completely revised and updated, this fourth edition retains the features that have made the book a perennial favorite. After reading each chapter you will feel as though you understand the context of how to practise ergonomics and what aspects of method selection and implementation you should consider. The book provides a guide to the benefits ergonomics and human factors can offer industry, business, or human service professionals.

This volume presents world-leading ideas and research that explores some of the most prominent topics relevant to detecting terrorism. The book is divided into six key themes: conceptualising terrorism, deception and decision making, social and cultural factors in terrorism, modelling hostile intent, strategies for counter-terrorism, and future directions. Twenty two chapters cover the spectrum of detecting terrorist activities, hostile intent, crowded public spaces and suspicious behaviour. The work draws from high impact research findings and presents case-studies to help communicate concepts. Specific areas of interest include methodological issues in counter-terrorism, counter terrorism policy and its impact on end users, novel research methods and innovative technologies in counter-terrorism. A variety of disciplines are represented by this work, including: ergonomics/human factors, psychology, criminology, cognitive science, sociology, political theory, art/design, engineering and computer science. This book not only expands the knowledge base of the subject area and is therefore of prime relevance to researchers investigating counter-terrorism, but provides a valuable resource to security stakeholders at policy and practitioner levels.

The text comprehensively discusses the latest mathematical modelling techniques and their applications in various areas such as fuzzy modelling, signal processing, neural network, machine learning, image processing, and their numerical analysis. It further covers image processing techniques like Viola-Jones Method for face detection and fuzzy approach for person video emotion. It will serve as an ideal reference text for graduate students and academic researchers in the fields of mechanical engineering, electronics, communication engineering, computer engineering, and mathematics. This book: Discusses applications of neural networks, machine learning, image processing, and mathematical modeling. Provides simulations techniques in machine learning and image processing-based problems. Highlights artificial intelligence and machine learning techniques in the detection of diseases. Introduces mathematical modeling techniques such as wavelet transform, modeling using differential equations, and numerical techniques for multi-dimensional data. Includes real-life problems for better understanding. The book presents mathematical modeling techniques such as wavelet transform, differential equations, and numerical techniques for multi-dimensional data. It will serve as an ideal reference text for graduate students and academic researchers in diverse engineering fields such as mechanical, electronics and communication and computer.

Risk is everywhere, in everything we do. Realizing this fact, we all must try to understand this "risk" and if possible to minimize it. This book expands the conversation beyond failure mode and effects analysis (FMEA) techniques. While FMEA is indeed a powerful tool to forecast failures for both design and processes, it is missing methods for considering safety issues, catastrophic events, and their consequences. Focusing on risk, safety, and HAZOP as they relate to major catastrophic events, Introduction to Risk and Failures: Tools and Methodologies addresses the process and implementation as well as understanding the fundamentals of using a risk methodology in a given organization for evaluating major safety and/or catastrophic problems.

The book identifies and evaluates five perspectives through which risk and uncertainty can be viewed and analyzed: individual and societal concerns, complexity in government regulations, patterns of employment, and polarization of approaches between large and small organizations. In addition to explaining what risk is and exploring how it should be understood, the author makes a distinction between risk and uncertainty. He elucidates more than 20 specific methodologies and/or tools to evaluate risk in a manner that is practical and proactive but not heavy on theory. He also includes samples of checklists and demonstrates the flow of analysis for any type of hazard.

Written by an expert with more than 30 years of experience, the book provides from-the-trenches examples that demonstrate the theory in action. It introduces methodologies such as ETA, FTA, and others which traditionally have been used specifically in reliability endeavors and details how they can be used in risk assessment. Highly practical, it shows you how to minimize or eliminate risks and failures for any given project or in any given work environment.

The availability of electric lighting has changed the lives of people the world over, yet as a major user of electricity it has come under increasing scrutiny in recent years. This scrutiny has focused largely on the environmental consequences, with little consideration of the benefits of lighting. Human Factors in Lighting, Third Edition restores some balance to the discussion by examining the ways in which people interact with lighting. These interactions influence the ability to perform visual tasks; the perception of people, objects, and spaces; human comfort and behavior; as well as human health and safety. It is only by understanding how to use light to achieve these ends that lighting can be provided effectively and efficiently to the benefit of all.

See What s New in the Third Edition:

• New chapters on the non-image-forming system, lighting for pedestrians, light pollution, and lighting and electricity use
• Revision of all other chapters to update them to take into account the advances that have been made in our understanding of the effects of light on people over the last decade
• Integration of the combined effects of light via the visual and non-image-forming systems on performance and perception

The book covers both the visual and the non-visual effects of light on people as well as the benefits of lighting and the costs it imposes on the environment. It details the consequences of exposure to lighting or lighting technology and the role of exposure to light on such basic functions of the body as circadian rhythms. The author combines information from many different sources and integrates them into a coherent overview of lighting practice that can be used to develop better lighting solutions at a lower environmental cost."

Business integrity is rarely a matter of straight-forward rules. As the nature and geography of business transactions become more complex, managers are required to make judgements and to tackle new ethical dilemmas that are often local and situational. Integrity in Business explores the complex nature of integrity and business and illustrates how organizations have avoided major setbacks to their reputations and value by encouraging integrity. It also examines those organizations that have failed or experienced serious reputational damage due to lack of preparation, lack of transparency and lack of leadership. Frank Holder analyzes how transparency and integrity depend on a state of balance in competition and knowing who you are doing business with. He explains the significance of leadership awareness which, whilst now global, is alert to the need to establish integrity in local markets. Using his research from a review of significant fraud cases, legislative mandates and governmental and nongovernmental initiatives over the past 15 years, the author provides a rigorous and sophisticated guide to understanding and adopting an holistic business integrity strategy- one which has a realistic chance of protecting your organization from the kind of catastrophic loss or reputational damage that can easily be the result of an error of judgement in a world that is increasingly connected and driven by instant and social media.

Over the last 50 years, the theory and the methods of reliability analysis have developed significantly. Therefore, it is very important to the reliability specialist to be informed of each reliability measure. This book will provide historical developments, current advancements, applications, numerous examples, and many case studies to bring the reader up-to-date with the advancements in this area. It covers reliability engineering in different branches, includes applications to reliability engineering practice, provides numerous examples to illustrate the theoretical results, and offers case studies along with real-world examples. This book is useful to engineering students, research scientist, and practitioners working in the field of reliability.

With the increase of globalization of business and industry, IT products and services are often produced and marketed across geographical cultural boundaries without adequate consideration of culture. There is a high probability that IT products and services developed in one country may not be effectively used in another country, which may hinder their market penetration, sales, and use. Based on research and practice, Cross-Cultural Design for IT Products and Services provides a resource for human factors engineers, designers, and marketing professionals who define and develop IT products and services for the global market. With its extensive review of cross-cultural theory and cross-cultural design literature, it is also a resource for those who are interested in research on cross-cultural design. The book presents an overview of the dimensions of culture that have implications for human information processing and affective response. It examines a set of user interface design guidelines grouped into five areas: language, use of color, icons and images, navigation, and information architecture. Also, it addresses physical ergonomics and anthropometry issues. The text translates theory and guidelines into a practical methodology and discusses how to integrate methods of cross-cultural design into a standard engineering process for product development. The authors review and reappraise theories, models, principles, and techniques for design of IT products and services that will be marketed globally. They provide guidelines for user interface design across North American, Asian, and other cultures. Applying the guidelines within the methodological framework provided will enhance the usability and effectiveness of the IT product or service, and contribute to greater user satisfaction, increased productivity, higher sales, and lower product support costs.

With the increase in legislation and the drive for ever-greater efficiency and accountability, health and safety in construction is becoming an increasingly important subject. This book covers the essential issues that apply specifically to construction projects, including the nature and causes of occupational injury or illness, project organisation and OHS, OHS risk management, OHS legislation, the psychology of OHS, behavioural safety management, using IT to manage OHS, and OHS training.

Numerous case studies illustrate important points and refer to current successful safety management techniques, giving practical guidance to the practitioner and putting the issues into context for the student. This book will be of specific interest to clients, project managers, specialist consultants, designers, contractors, sub-contractors and suppliers.

Table of Contents

1. Introduction 2. Occupational Health and Safety Law 3. Organizational Issues 4. Systems Management of OHS 5. Managing OHS Risk 6. Ergonomics in Construction 7. The Psychology of OHS 8. Behavioural Safety Management 9. Innovation and IT in OHS Management 10. Conclusions

Despite diagnosis being the key feature of a physician's clinical performance, this is the first book that deals specifically with the topic. In recent years, however, considerable interest has been shown in this area and significant developments have occurred in two main areas: a) an awareness and increasing understanding of the critical role of clinical decision making in the process of diagnosis, and of the multiple factors that impact it, and b) a similar appreciation of the role of the healthcare system in supporting clinicians in their efforts to make accurate diagnoses. Although medicine has seen major gains in knowledge and technology over the last few decades, there is a consensus that the diagnostic failure rate remains in the order of 10-15%. This book provides an overview of the major issues in this area, in particular focusing on where the diagnostic process fails, and where improvements might be made.

Increased concern for patient safety has put the issue at the top of the agenda of practitioners, hospitals, and even governments. The risks to patients are many and diverse, and the complexity of the healthcare system that delivers them is huge. Yet the discourse is often oversimplified and underdeveloped. Written from a scientific, human factors perspective, Patient Safety: A Human Factors Approach delineates a method that can enlighten and clarify this discourse as well as put us on a better path to correcting the issues. People often think, understandably, that safety lies mainly in the hands through which care ultimately flows to the patient-those who are closest to the patient, whose decisions can mean the difference between life and death, between health and morbidity. The human factors approach refuses to lay the responsibility for safety and risk solely at the feet of people at the sharp end. That is where we should intervene to make things safer, to tighten practice, to focus attention, to remind people to be careful, to impose rules and guidelines. The book defines an approach that looks relentlessly for sources of safety and risk everywhere in the system-the designs of devices; the teamwork and coordination between different practitioners; their communication across hierarchical and gender boundaries; the cognitive processes of individuals; the organization that surrounds, constrains, and empowers them; the economic and human resources offered; the technology available; the political landscape; and even the culture of the place. The breadth of the human factors approach is itself testimony to the realization that there are no easy answers or silver bullets for resolving the issues in patient safety. A user-friendly introduction to the approach, this book takes the complexity of health care seriously and doesn't over simplify the problem. It demonstrates what the approach does do, that is offer the substance and guidance to consider the issues in all their nuance and complexity.

Literally hundreds of papers have been written about interface issues experienced by older adults, but how many actually influence the designs older adults use? The sheer number of articles available, the fast pace of the industry, and time constraints combine to build barriers to knowledge transfer from theory into practice. A distillation of decades of published research, Designing Displays for Older Adults is a primer on age-related changes in cognition, perception, and behavior organized into meaningful principles that improve understanding.

Using theory backed up by evidence provides an understanding of why we see certain problems with many displays and often predicts solutions. This understanding surpasses an individual interface and provides practitioners with ways to plan for older adults on multiple display types. Based on this, the book delineates the theories, then explores how to apply them in real design exercises, providing specific guidelines for display examples that bridge theory and practice. The authors explore the complex set of mental and physical changes that occur during aging and that can affect technology acceptance, adoption, interaction, safety, and satisfaction.

This book provides a fundamental understanding of age related change and explores how such information can influence design from the very beginning stages, rather than waiting for testing to reveal the problems users have with the product. The authors open the way for designing with an understanding of these changes that results in better products and systems for users in all life stages.

Explore the Role People Play within Safety Critical Systems

"Single Volume Consolidates Information Previously Scattered throughout the Literature"

The piecemeal fashion in which human factors research has been conducted in the maritime domain makes information retrieval available only by scanning through numerous research journals and conference papers. Bringing together human factors information from this and other domains, Human Factors in the Maritime Domain integrates a common body of knowledge into one single volume.

"A Holistic Approach Based on a Socio-Technical System"

The book provides the vital background information necessary to acquire a core knowledge base and a much-needed overview of human factors within the maritime domain. It starts by putting the topic into an historical and theoretical context, moves onto more specific and detailed topics and contemporary thinking in human factors, then reviews new maritime technology. The authors take a holistic approach based on a model of the socio-technical system of work in the maritime domain. They synthesize available knowledge and research, then present in an easily acceptable framework with example, illustrations, and case studies whenever possible, making the text rigorous, useful, and enjoyable.

"Experts Provide a Theoretical and Scientific Perspective"

The three authors draw on a range of diverse backgrounds including working as a maritime surveyor, transport consultant, human factors lecturer, and mechanical engineer. They have undertaken maritime research in Denmark, Australia, Malta, and the UK. They have published several other human factor books on related topics. This combination of human factorsknowledge, maritime wisdom, and substantial publication experience results in a book that is effective and practical.

Critical incident stress management (CISM) is now a well-established method in crisis intervention, and one that is clearly needed within aviation. However, there are many peculiarities in this branch of CISM which require thorough consideration. People working in high-reliability environments need to be sensitive to others' reactions to critical stress. They are the normal reactions of normal people in abnormal situations. However, to ensure this a proper programme must be put in place, based on a scientific and standardized approach. This book describes the various methods and elements of the CISM model, as well as their interventions. It also investigates the benefits of CISM on the individual level and on an organisational strategic level. It details CISM training and courses, and features a case study based on the Ãœberlingen accident of 2002. Critical Incident Stress Management in Aviation will be of direct relevance to human factors experts, safety managers, ATCOs and air navigation service providers, though there is also much that will be of interest to aviation physicians, psychologists and airport/airline managers.

Table of Contents

Chapter 1 Introduction, Joachim Vogt, Jörg Leonhardt; Chapter 2 Importance of CISM in Modern Air Traffic Management (ATM), Ralph Riedle; Chapter 3 Critical Incident Stress Management in Aviation: A Strategic Approach, Jeffrey T. Mitchell; Chapter 4 Critical Incident, Critical Incident Stress, Post Traumatic Stress Disorder – Definitions and Underlying Neurobiological Processes, Jörg Leonhardt, Joachim Vogt; Chapter 5 Critical Incident Stress Management Intervention Methods, Jörg Leonhardt; Chapter 6 A Brief History of Crisis Intervention Support Services in Aviation, Jeffrey T. Mitchell; Chapter 7 Critical Incident Stress Management in Air Traffic Control (ATC), Jörg Leonhardt; Chapter 8 Critical Incident Stress Managementin Airlines, Johanna O’Flaherty; Chapter 9 Critical Incident Stress Management at Frankfurt Airport (CISM Team FRAPORT), Walter Gaber, Annette Drozd; Chapter 10 Case Study Lake Constance (Überlingen), Jörg Leonhardt, Carol Minder, Sabine Zimmermann, Ralf Mersmann, Ralf Schultze; Chapter 11 Training in Critical Incident Stress Management – Principles and Standards, Victor Welzant, Amie Kolos; Chapter 12 Cost Benefit Analysis of a Critical Incident Stress Management Program, Joachim Vogt, Stefan Pennig Appendices;

Reflecting changes in the field during the ten years since the publication of the first edition, Developing a Safety and Health Program, Second Edition examines the elements of a safety and health program and delineates how to incorporate them into an organization's safety efforts. It begins by defining safety policy and providing an overview of OSHA and other regulatory agencies. It covers hazard communication safety training and describes how to write material safety data sheets, how to maintain a good fire loss control program, and procedures for developing an emergency response plan. The Second Edition includes: Changes all companies must make to be proactive in their security in the wake of 9/11 and the creation of the department of homeland security Additional coverage of labels, signs, and placards; the national incident management system; and homeland security Updated information on safety, hazardous materials management, and accident investigation New information on fire loss control programs, emergency response plans, and personal protective equipment Changes in regulations and standards within the safety, health, and environmental management industry Discussion of how advanced management concepts such as participated management can improve preventative programs and decrease the risk of cumulative trauma disorders The book discusses how to reduce equipment-related injuries through more advanced lockout/tagout procedures and safety checklists to ensure that everything is covered. The author addresses the special considerations important in planning for disasters and terrorist attacks. He provides the basic knowledge of OSHA, NFPA, and other regulations needed to assist and define what an enterprise must have when developing a program with the different elements of safety. Each chapter contains questions to test comprehe