Usability and Human Factors Unit 4a Human Factors and Healthcare

Overview Introduction to human factors principles Applied cognitive psychology/selective attention Patient safety Understanding human errors A Systems-centered approach to human errors Mental workload Medical devices Component 15/Unit 4a Health IT Workforce Curriculum Version 1.0/Fall

Human Factors & Health Care Health Devices Electronic Health Record Systems Component 15/Unit 4a Health IT Workforce Curriculum Version 1.0/Fall Component 15/Unit 43 Health IT Workforce Curriculum Version 1.0/Fall 2010

Human Factors and HCI Redux Histories, journals, academic and professional societies HCI focused on computing and innovative design HF focused on any system and greater emphasis on work/workplace and on devices Safety is a core issue in HF Differences: Component 15/Unit 4a Health IT Workforce Curriculum Version 1.0/Fall Differences: –Histories, journals, academic and professional societies –HCI focused on computing and innovative design –HF focused on any system and greater emphasis on work/workplace and on devices –Safety is a core issue in HF

Human Factors and HCI Redux User-centered and systems approach Draws on cognitive psychology and other social sciences Similar methods with regards to usability evaluation Cognitive task analysis Usability testing Similarities: Component 15/Unit 4a Health IT Workforce Curriculum Version 1.0/Fall –Si User-centered and systems approach –Draws on cognitive psychology and other social sciences –Similar methods with regards to usability evaluation Cognitive task analysis Usability testing milarities: –User-centered and systems approach –Draws on cognitive psychology and other social sciences –Similar methods with regards to usability evaluation Cognitive task analysis Usability testing

History of Human Factors Industrial efforts to increase worker productivity : Formal beginning of the profession – military 1945 – 1960: rapid growth and expansion – space program, product design, workplace design 1960 – 1980: Human computer interaction, safety/human error 1980 – 1990: e.g., healthcare, aging, aviation safety, standardization 1990 – Present expansion Component 15/Unit 4a 6 Health IT Workforce Curriculum Version 1.0/Fall : –Industrial efforts to increase worker productivity 1945 – 1960: –Formal beginning of the profession – military 1960 – 1980: –rapid growth and expansion – space program, product design, workplace design 1980 – 1990: –Human computer interaction, safety/human error 1990 – Present expansion –e.g., healthcare, aging, aviation safety, standardization

Why is Human Factors Increasingly Important Diversity of user groups Complexity of systems Increased use of technology Increased “costs” of human error Societal emphasis on well-being and quality of life Component 15/Unit 4a Health IT Workforce Curriculum Version 1.0/Fall

Human Factors Objective Focus: Human beings and their interactions with products/equipment, tasks, environments (Micro, macro, ambient) Goal: Design systems and system components to match the capabilities and limitations of humans who use them Optimize working & living conditions Component 15/Unit 4a Health IT Workforce Curriculum Version 1.0/Fall Focus: –Human beings and their interactions with products/equipment, tasks, environments –(Micro, macro, ambient) Goal: –Design systems and system components to match the capabilities and limitations of humans who use them –Optimize working & living conditions

Examples of Application Areas Military Highway systems –e.g. readability and comprehensibility of signs Automobile design and driver behavior Human-computer systems Healthcare and patient safety Aging and accessibility Nuclear power Workplace layout and furnishings Airline industry –e.g. pilot workload, aircraft design, automation, aircraft maintenance Quality control Component 15/Unit 4a Health IT Workforce Curriculum Version 1.0/Fall

Nuclear Power Plant Control Room Component 15/Unit 4a Health IT Workforce Curriculum Version 1.0/Fall

Airplane Cockpit Component 15/Unit 4a Health IT Workforce Curriculum Version 1.0/Fall

Human Factors in Medicine Infusion pumps Anesthesia equipment Medication errors Effects of fatigue on resident’s performance Judgmental limitations in medical decision making Inadequate infection control Unintended consequences of automation Component 15/Unit 4a Health IT Workforce Curriculum Version 1.0/Fall

Human Factors/Ergonomics (Carayon, 2007) Scientific discipline concerned with the understanding interactions –Among humans –Other elements of a system Profession that applies theory, principles, data, methods to design in order to optimize human well-being and overall system performance System can be a technology, device, person, team, organization, policy, guideline or physical environment Component 15/Unit 4a Health IT Workforce Curriculum Version 1.0/Fall

Human Factors Ergonomics: 3 Major Domains Component 15/Unit 4a Health IT Workforce Curriculum Version 1.0/Fall Physical Ergonomics Cognitive Ergonomics Organizational / Macroergonomics Physical Ergonomics Cognitive Ergonomics Organizational / Macroergonomics

Physical Ergonomics Topics: Repetitive movements, workplace layout, safety and health Application to Health: Reducing and preventing injury, designing workstations and work rooms for optimal human performance Examples: Designing a patient room to facilitate and support patient care Designing medical labels so that they are readable and understandable Concerned with physical activity Component 15/Unit 4a Health IT Workforce Curriculum Version 1.0/Fall Concerned with physical activity –Topics: Repetitive movements, workplace layout, safety and health –Application to Health: Reducing and preventing injury, designing workstations and work rooms for optimal human performance –Examples: Designing a patient room to facilitate and support patient care Designing medical labels so that they are readable and understandable

Organizational Ergonomics Topics: communication, teamwork, participatory design, quality management Application to Health: Reducing stress and burnout, improving satisfaction and retention, implementing improvement activities Examples: Management training in surgery teams Designing work schedules for reduced fatigue and enhanced performance Concerned with sociotechnical systems Component 15/Unit 4a Health IT Workforce Curriculum Version 1.0/Fall Concerned with sociotechnical systems –Topics: communication, teamwork, participatory design, quality management –Application to Health: Reducing stress and burnout, improving satisfaction and retention, implementing improvement activities –Examples: Management training in surgery teams Designing work schedules for reduced fatigue and enhanced performance

Cognitive Ergonomics Topics: mental workload, decision making, skilled performance, HCI, work stress, Application to Health: usability, designing training systems, usable interfaces Examples: Event report systems Implementing incident analysis system Concerned with mental processes Component 15/Unit 4a Health IT Workforce Curriculum Version 1.0/Fall Concerned with mental processes –Topics: mental workload, decision making, skilled performance, HCI, work stress, –Application to Health: usability, designing training systems, usable interfaces –Examples: Event report systems Implementing incident analysis system

Human Factors & Applied Cognitive Psychology Applies knowledge about human strengths and limitations to design of interactive systems, equipment, and their environment to ensure their effectiveness, safety, and ease of use Perception, attention, memory, mental models and decision making are central to human factors research and analysis Component 15/Unit 4a Health IT Workforce Curriculum Version 1.0/Fall

Human Attention Selective MechanismResource needed for information processingLimitedSharableFlexible Component 15/Unit 4a 19 Health IT Workforce Curriculum Version 1.0/Fall 2010 Selective Mechanism Resource needed for information processing Limited Sharable Flexible

Selective Attention Ability to ignore extraneous information and focus on relevant inputs Performance typically declines as the number of sources of information increases Humans can only process information at a finite rateInformation overload contributes to errors Component 15/Unit 4a Health IT Workforce Curriculum Version 1.0/Fall Ability to ignore extraneous information and focus on relevant inputs Performance typically declines as the number of sources of information increases Humans can only process information at a finite rate Information overload contributes to errors

Information Overload Speed Stress Speed/Accuracy Tradeoff Load Stress Component 15/Unit 4a 21 Health IT Workforce Curriculum Version 1.0/Fall 2010 Speed Stress Speed/Accuracy Tradeoff Load Stress

Selective Attention Four factors drive the selection of channels to attend (and the filtering of channels to ignore): Events or stimuli that are salient capture attention (this represents a bottom-up process) Salience: We tend to “sample” the world where we expect to find information, and attend to channels based on how valuable it is to look or costly to miss Expectancy and Value: Selective attention may be inhibited if it is effortful Effort: Component 15/Unit 4a Health IT Workforce Curriculum Version 1.0/Fall Four factors drive the selection of channels to attend (and the filtering of channels to ignore): Salience: –Events or stimuli that are salient capture attention (this represents a bottom-up process) Expectancy and Value: –We tend to “sample” the world where we expect to find information, and attend to channels based on how valuable it is to look or costly to miss Effort: –Selective attention may be inhibited if it is effortful

Divided Attention or Time Sharing Time-sharing: –ability to perform more than one cognitive task by attending to both at once or rapidly switching back and forth between them Because cognitive resources for attention are relatively limited, time-sharing often results in a drop in performance for one or both tasks People can also “modulate” the resources given to one task or the other Component 15/Unit 4a Health IT Workforce Curriculum Version 1.0/Fall

Human Factors Design Implications Reduce the number of competing channels of information Make sources of information as distinct as possible Provide feedback Use redundant cues Work/rest scheduling Training Component 15/Unit 4a Health IT Workforce Curriculum Version 1.0/Fall