Checklists in Action

The Power of Checklists in Healthcare and Beyond

Complex Systems Need Layered Protection

Introduction

Navigating Risks and Safety Layers in Surgery

Imagine standing in the pouring rain, equipped with all the rain gear
you can think of—umbrella, hat, raincoat, and even shelter under a roof. Despite these layers of protection, there are moments when the rain manages to find a way in. This situation is analogous to what James Reason termed the Swiss Cheese Model, illustrating that even with multiple safety measures, vulnerabilities can align, leading to mistakes.¹²



In critical environments like hospitals, where safety is paramount, the Swiss Cheese Model is utilized to comprehend and prevent errors. One specific tool derived from this understanding is the Surgical Safety Checklist—a tool designed to prevent errors and ensure a high level of safety. It's akin to systematically addressing potential holes in the Swiss cheese to create a more secure and reliable system.

HISTORY

The Making
of the Checklist

The Making of the Checklist

1960

2001

2003 - 2006

2007 - 2008

2009

1960

2001

2003 - 2006

2007 - 2008

2009

EHR icon graph

The Nurses’ Checklist

Nurses developed patient charts and forms that incorporated the monitoring of four vital signs: body temperature, pulse, blood pressure, and respiratory rate. These tools enabled them to track their patients' health status by regularly checking and evaluating vital signs every six hours. This system helped ensure that patients received timely and appropriate medical attention when necessary.⁵

EHR icon graph

1960

The Nurses’ Checklist

Nurses developed patient charts and forms that incorporated the monitoring of four vital signs: body temperature, pulse, blood pressure, and respiratory rate. These tools enabled them to track their patients' health status by regularly checking and evaluating vital signs every six hours. This system helped ensure that patients received timely and appropriate medical attention when necessary.⁵

EHR icon graph

The Nurses’ Checklist

Nurses developed patient charts and forms that incorporated the monitoring of four vital signs: body temperature, pulse, blood pressure, and respiratory rate. These tools enabled them to track their patients' health status by regularly checking and evaluating vital signs every six hours. This system helped ensure that patients received timely and appropriate medical attention when necessary.⁵

EHR icon graph

Peter Pronovost's Checklist

Critical care specialist Peter Pronovost introduced a checklist system at Johns Hopkins Hospital's ICU. The system included five simple steps that nurses could use to observe doctors and stop them if they skipped a step. This collaborative approach allowed for effective communication between medical professionals and resulted in a remarkable outcome. Within a year, infections dropped from 11% to 0%, preventing 43 infections and eight deaths and saving the hospital $2 million in costs.⁵

EHR icon graph

2001

Peter Pronovost’s Checklist

Nurses developed patient charts and forms that incorporated the monitoring of four vital signs: body temperature, pulse, blood pressure, and respiratory rate. These tools enabled them to track their patients' health status by regularly checking and evaluating vital signs every six hours. This system helped ensure that patients received timely and appropriate medical attention when necessary.⁵

EHR icon graph

Peter Pronovost's Checklist

Critical care specialist Peter Pronovost introduced a checklist system at Johns Hopkins Hospital's ICU. The system included five simple steps that nurses could use to observe doctors and stop them if they skipped a step. This collaborative approach allowed for effective communication between medical professionals and resulted in a remarkable outcome. Within a year, infections dropped from 11% to 0%, preventing 43 infections and eight deaths and saving the hospital $2 million in costs.⁵

EHR icon graph

The Michigan Keystone ICU Project

The Keystone Initiative in Michigan utilized a checklist system to enhance patient safety in ICUs. Each participating hospital rolled out the checklist and observed the results with Peter Pronovost's supervision. Within three months, the infection rate in Michigan's ICUs dropped by 66%, saving more than 1,500 lives and reducing costs by roughly $175 million.¹²

EHR icon graph

2003-2006

The Michigan Keystone ICU Project

Nurses developed patient charts and forms that incorporated the monitoring of four vital signs: body temperature, pulse, blood pressure, and respiratory rate. These tools enabled them to track their patients' health status by regularly checking and evaluating vital signs every six hours. This system helped ensure that patients received timely and appropriate medical attention when necessary.⁵

EHR icon graph

The Michigan Keystone ICU Project

The Keystone Initiative in Michigan utilized a checklist system to enhance patient safety in ICUs. Each participating hospital rolled out the checklist and observed the results with Peter Pronovost's supervision. Within three months, the infection rate in Michigan's ICUs dropped by 66%, saving more than 1,500 lives and reducing costs by roughly $175 million.¹²

EHR icon graph

Safe Surgery Saves Lives

To enhance patient safety and implement safer surgical procedures, a global research team led by Atul Gawande launched a project aimed at reducing adverse events in both operating rooms and wards. The team selected eight hospitals worldwide. This initiative reflects the importance of a global approach to patient safety, utilizing evidence-based practices and collaboration to improve outcomes in healthcare settings worldwide.⁹

EHR icon graph

2007-2008

Safe Surgery Saves Lives

Nurses developed patient charts and forms that incorporated the monitoring of four vital signs: body temperature, pulse, blood pressure, and respiratory rate. These tools enabled them to track their patients' health status by regularly checking and evaluating vital signs every six hours. This system helped ensure that patients received timely and appropriate medical attention when necessary.⁵

EHR icon graph

Safe Surgery Saves Lives

To enhance patient safety and implement safer surgical procedures, a global research team led by Atul Gawande launched a project aimed at reducing adverse events in both operating rooms and wards. The team selected eight hospitals worldwide. This initiative reflects the importance of a global approach to patient safety, utilizing evidence-based practices and collaboration to improve outcomes in healthcare settings worldwide.⁹

EHR icon graph

The Official Checklist

After extensive research spanning several years, the World Health Organization developed a surgical safety checklist in 2009 that healthcare workers worldwide use in their operating rooms today. This standardized and universal checklist has become an essential tool for ensuring patient safety during surgical procedures, reflecting the WHO's commitment to improving healthcare outcomes globally.¹⁰

EHR icon graph

2009

The Official Checklist

Nurses developed patient charts and forms that incorporated the monitoring of four vital signs: body temperature, pulse, blood pressure, and respiratory rate. These tools enabled them to track their patients' health status by regularly checking and evaluating vital signs every six hours. This system helped ensure that patients received timely and appropriate medical attention when necessary.⁵

EHR icon graph

The Official Checklist

After extensive research spanning several years, the World Health Organization developed a surgical safety checklist in 2009 that healthcare workers worldwide use in their operating rooms today. This standardized and universal checklist has become an essential tool for ensuring patient safety during surgical procedures, reflecting the WHO's commitment to improving healthcare outcomes globally.¹⁰

NUMBERS

The Effects of Checklist Around the World

As of 2019, the WHO's checklist is utilized in 70% of operating rooms worldwide, with over 20 countries adopting it as their national standard.¹⁰

2009

50%

A reduction in mortality was observed across the eight hospitals during the WHO's initial research.¹⁰

Since the WHO introduced its Surgical Safety Checklist, research on its impact has grown rapidly. Studies show it improves patient safety, operating room efficiency, and team communication—benefits achievable in hospitals of any size or budget. Today, the checklist is a cornerstone of surgical safety, driving safer, more reliable care worldwide.

Research on the Efficacy of the Surgical Safety Checklist
The number of research papers since the World Health Organization's endorsement
4
1994
6
1997
4
2000
3
2003
7
2006
70
2009
130
2012
140
2012
140
2015
155
2018
170
2021

STUDIES

STUDIES

Surgical Safety Checklist Benefits

Surgical Safety
Checklist Benefits

Global studies on efficacy of the Surgical Safety Checklist

EHR icon graph
EHR icon graph
EHR icon graph
Decreases Infections

Decreases Infections

In 2021, a study in Brazil concluded that the implementation of the surgical checklist in 2010 reduced surgical site infections (SSI), particularly in contaminated and infected wounds.³ According to their findings, the checklist also lowered infections caused by hard-to-treat microorganisms, decreased antimicrobial resistance, and led to a 3.2% drop in in-hospital mortality. The use of the checklist demonstrated a positive impact on patient safety and outcomes.

EHR icon graph
EHR icon graph
EHR icon graph
Drops Morbidity Rates

Drops Morbidity Rates

In a 2012 comparative study at the University of Connecticut’s Department of Surgery, a checklist was introduced for high-risk procedures through three 60-minute team training sessions. With a 97.26% completion rate, checklist use was associated with a marked reduction in 30-day morbidity, from 23.60% to 8.20% compared with historical controls. The study demonstrated that combining a comprehensive checklist with team training can significantly improve patient outcomes and surgical safety.

EHR icon graph
EHR icon graph
EHR icon graph
Shortens Hospital Stays

Shortens Hospital Stays

In 2015, a randomized controlled trial conducted in Norway revealed that the use of the WHO Surgical Safety Checklist (SSC) led to shorter hospital stays by almost a day on average. It significantly lowered complications during hospital stays, dropping from 19.9% to 11.5%. The checklist proved effective, reducing the chances of issues (hence shorter stays) even when considering other factors.⁶

In 2015, a randomized controlled trial conducted in Norway revealed that the use of the WHO Surgical Safety Checklist (SSC) led to shorter hospital stays by almost a day on average. It significantly lowered complications during hospital stays, dropping from 19.9% to 11.5%. The checklist proved effective, reducing the chances of issues (hence shorter stays) even when considering other factors.⁶

EHR icon graph
EHR icon graph
EHR icon graph
Improves Teamwork

Improves Teamwork

In 2023, a qualitative study conducted in Switzerland revealed positive impacts on leadership, teamwork, timing, and acceptance with the use of the WHO Surgical Safety Checklist. Challenges, including understanding and training gaps, resulted in execution variations despite effective implementation. Improvement in teamwork and communication occurred, but hurdles influenced overall effectiveness.¹³

In 2023, a qualitative study conducted in Switzerland revealed positive impacts on leadership, teamwork, timing, and acceptance with the use of the WHO Surgical Safety Checklist. Challenges, including understanding and training gaps, resulted in execution variations despite effective implementation. Improvement in teamwork and communication occurred, but hurdles influenced overall effectiveness.¹³

EHR icon graph
EHR icon graph
EHR icon graph
Enhances Safety Culture

Enhances Safety Culture

In 2012, a 20-study review conducted in Germany underscored the powerful impact of the Surgical Safety Checklist, revealing up to a 62% reduction in perioperative mortality and a 37% drop in morbidity. The study concluded that the checklist serves as a crucial instrument for enhancing communication, teamwork, and safety culture in the operating room.⁴

In 2012, a 20-study review conducted in Germany underscored the powerful impact of the Surgical Safety Checklist, revealing up to a 62% reduction in perioperative mortality and a 37% drop in morbidity. The study concluded that the checklist serves as a crucial instrument for enhancing communication, teamwork, and safety culture in the operating room.⁴

EHR icon graph
EHR icon graph
EHR icon graph
Flexible to Surgical Contexts

Flexible to Surgical Contexts

In a 2015 study conducted in India involving 700 surgery patients, those using a modified WHO Surgical Safety Checklist (Rc Arm) demonstrated significant improvements, with lower rates of complications such as wounds, abdominal issues, and bleeding. The study emphasized that the surgical safety checklist is not a rigid manual but a dynamic aid, adapting to various surgical contexts to enhance patient safety.²

In a 2015 study conducted in India involving 700 surgery patients, those using a modified WHO Surgical Safety Checklist (Rc Arm) demonstrated significant improvements, with lower rates of complications such as wounds, abdominal issues, and bleeding. The study emphasized that the surgical safety checklist is not a rigid manual but a dynamic aid, adapting to various surgical contexts to enhance patient safety.²

INDUSTRIES

Checklists in Other Industries

From aviation to finance, checklists enhance safety and compliance. See when they saved lives and when ignoring them proved costly.

INDUSTRIES

Checklists in Other Industries

From aviation to finance, checklists enhance safety and compliance. See when they saved lives and when ignoring them proved costly.

AVIATION

The Miracle on the Hudson

In 2009, US Airways Flight 1549 struck a flock of geese after take-off, resulting in a complete loss of engine power. Captain Sullenberger and First Officer Skiles skillfully landed the plane in the Hudson River, ensuring the survival of all 155 people on board. The pilots' adherence to checklists, communication, and mutual support played a critical role, highlighting the significance of discipline and teamwork in aviation safety.⁵

AVIATION

The Miracle on the Hudson

In 2009, US Airways Flight 1549 struck a flock of geese after take-off, resulting in a complete loss of engine power. Captain Sullenberger and First Officer Skiles skillfully landed the plane in the Hudson River, ensuring the survival of all 155 people on board. The pilots' adherence to checklists, communication, and mutual support played a critical role, highlighting the significance of discipline and teamwork in aviation safety.⁵

AVIATION

The Miracle on the Hudson

In 2009, US Airways Flight 1549 struck a flock of geese after take-off, resulting in a complete loss of engine power. Captain Sullenberger and First Officer Skiles skillfully landed the plane in the Hudson River, ensuring the survival of all 155 people on board. The pilots' adherence to checklists, communication, and mutual support played a critical role, highlighting the significance of discipline and teamwork in aviation safety.⁵

AEROSPACE

The Fourth Crew Memeber

Checklists played a crucial role in the Apollo 11 mission. From operating onboard computers to spacesuit procedures, every corner of the Apollo environment had a checklist. Even outside the spacecraft, astronauts relied heavily on checklists, with cuff checklists attached to their wrists. These checklists were so significant that Michael Collins referred to them as "The Fourth Crew Member," highlighting their importance in the mission's success.⁷

AEROSPACE

The Fourth Crew Memeber

Checklists played a crucial role in the Apollo 11 mission. From operating onboard computers to spacesuit procedures, every corner of the Apollo environment had a checklist. Even outside the spacecraft, astronauts relied heavily on checklists, with cuff checklists attached to their wrists. These checklists were so significant that Michael Collins referred to them as "The Fourth Crew Member," highlighting their importance in the mission's success.⁷

CONSTRUCTION

A Deadly Dance Night

In 1981, during a dance event at the Hyatt Regency Hotel in Kansas City, two suspended walkways collapsed, resulting in 114 fatalities and 216 injuries. The accident was caused by last-minute engineering changes, approved without thorough review and calculations. This event underscored the importance of effective communication,
documentation, and checklists in preventing accidents.⁸

CONSTRUCTION

A Deadly Dance Night

In 1981, during a dance event at the Hyatt Regency Hotel in Kansas City, two suspended walkways collapsed, resulting in 114 fatalities and 216 injuries. The accident was caused by last-minute engineering changes, approved without thorough review and calculations. This event underscored the importance of effective communication,
documentation, and checklists in preventing accidents.⁸

NUCLEAR POWER

The Worst Nuclear Disaster

The Worst Nuclear Disaster

In 1986, the Chernobyl disaster resulted from a reactor shutdown gone wrong, leading to explosions, fires, and the release of radioactive materials. The accident exposed a weak safety culture, a lack of communication among stakeholders, coupled with strict hierarchies. The implementation of a checklist might have clarified procedures and ensured that key safety protocols were followed during routine operations and emergencies.¹¹

CHALLENGES

Roadblocks in Implementation and Adherence

Lorem ipsum dolor sit amet ignis aurum probat primum non nocere aurum probatium wingardium leviosa expecto patronum.

Room State module UI
Cultural Challenges

In the operating room, advocates of checklists encounter resistance to change, lack of prioritization, poor team communication, and deep-rooted hierarchical structures, all of which can significantly diminish the efficacy of checklists.

The Black Box Platform™ Solution

The OR Black Box facilitates team communication by enabling practitioners to assess their team's performance within a non-punitive environment. Fostering a culture of open communication and feedback can promote buy-in and acceptance.

Room State module UI
Cultural Challenges

In the operating room, advocates of checklists encounter resistance to change, lack of prioritization, poor team communication, and deep-rooted hierarchical structures, all of which can significantly diminish the efficacy of checklists.

The Black Box Platform™ Solution

The OR Black Box facilitates team communication by enabling practitioners to assess their team's performance within a non-punitive environment. Fostering a culture of open communication and feedback can promote buy-in and acceptance.

Room State module UI
Cultural Challenges

In the operating room, advocates of checklists encounter resistance to change, lack of prioritization, poor team communication, and deep-rooted hierarchical structures, all of which can significantly diminish the efficacy of checklists.

The Black Box Platform™ Solution

The OR Black Box facilitates team communication by enabling practitioners to assess their team's performance within a non-punitive environment. Fostering a culture of open communication and feedback can promote buy-in and acceptance.

Room State module UI
Efficiency Challenges

Checklists can inadvertently introduce efficiency hurdles. The additional workload associated with them must be managed effectively to prevent employee burnout and maintain a balance between high-quality care delivery and efficiency.

The Black Box Platform™ Solution

The OR Black Box optimizes workflow by customizing checklists to meet the specific needs of each hospital. It regularly monitors their efficacy without imposing additional workload on hospital staff.

Room State module UI
Efficiency Challenges

Checklists can inadvertently introduce efficiency hurdles. The additional workload associated with them must be managed effectively to prevent employee burnout and maintain a balance between high-quality care delivery and efficiency.

The Black Box Platform™ Solution

The OR Black Box optimizes workflow by customizing checklists to meet the specific needs of each hospital. It regularly monitors their efficacy without imposing additional workload on hospital staff.

Room State module UI
Efficiency Challenges

Checklists can inadvertently introduce efficiency hurdles. The additional workload associated with them must be managed effectively to prevent employee burnout and maintain a balance between high-quality care delivery and efficiency.

The Black Box Platform™ Solution

The OR Black Box optimizes workflow by customizing checklists to meet the specific needs of each hospital. It regularly monitors their efficacy without imposing additional workload on hospital staff.

Room State module UI
Execution Challenges

Insufficient training, lack of ownership, and unclear expectations lead to shortcuts and a checkbox mentality, rather than fostering a shared, collaborative mental model of the procedure. This undermines the effectiveness and purpose of the checklist.

The Black Box Platform™ Solution

The OR Black Box implements a checklist adaptable to diverse settings, following universal standards. This approach ensures that clear expectations for improvement are known and measured, promoting the use of checklists as collaborative tools.

Room State module UI
Execution Challenges

Insufficient training, lack of ownership, and unclear expectations lead to shortcuts and a checkbox mentality, rather than fostering a shared, collaborative mental model of the procedure. This undermines the effectiveness and purpose of the checklist.

The Black Box Platform™ Solution

The OR Black Box implements a checklist adaptable to diverse settings, following universal standards. This approach ensures that clear expectations for improvement are known and measured, promoting the use of checklists as collaborative tools.

Room State module UI
Execution Challenges

Insufficient training, lack of ownership, and unclear expectations lead to shortcuts and a checkbox mentality, rather than fostering a shared, collaborative mental model of the procedure. This undermines the effectiveness and purpose of the checklist.

The Black Box Platform™ Solution

The OR Black Box implements a checklist adaptable to diverse settings, following universal standards. This approach ensures that clear expectations for improvement are known and measured, promoting the use of checklists as collaborative tools.

Room State module UI
Measurement Challenges

Maintaining quality and compliance standards presents a challenge when audits are infrequent, poorly executed, short-lived, and reluctant to incorporate feedback aimed at enhancing the checklist's execution.

The Black Box Platform™ Solution

The OR Black Box conducts regular audits to assess its adherence and effectiveness, serving as a centralized hub. It establishes a clear communication channel and feedback mechanism to address measurement and scalability challenges as they arise.

Room State module UI
Measurement Challenges

Maintaining quality and compliance standards presents a challenge when audits are infrequent, poorly executed, short-lived, and reluctant to incorporate feedback aimed at enhancing the checklist's execution.

The Black Box Platform™ Solution

The OR Black Box conducts regular audits to assess its adherence and effectiveness, serving as a centralized hub. It establishes a clear communication channel and feedback mechanism to address measurement and scalability challenges as they arise.

Room State module UI
Measurement Challenges

Maintaining quality and compliance standards presents a challenge when audits are infrequent, poorly executed, short-lived, and reluctant to incorporate feedback aimed at enhancing the checklist's execution.

The Black Box Platform™ Solution

The OR Black Box conducts regular audits to assess its adherence and effectiveness, serving as a centralized hub. It establishes a clear communication channel and feedback mechanism to address measurement and scalability challenges as they arise.

References

¹ Bliss, L. A., Ross-Richardson, C. B., Sanzari, L. J., Shapiro, D. S., Lukianoff, A. E., Bernstein, B. A., & Ellner, S. J. (2012). Thirty-day outcomes support implementation of a surgical safety checklist. Journal of the American College of Surgeons215(6), 766–776. https://doi.org/10.1016/j.jamcollsurg.2012.07.015 

² Chaudhary, N., Varma, V., Kapoor, S., Mehta, N., Kumaran, V., & Nundy, S. (2015). Implementation of a surgical safety checklist and postoperative outcomes: a prospective randomized controlled study. Journal of gastrointestinal surgery : official journal of the Society for Surgery of the Alimentary Tract19(5), 935–942. https://doi.org/10.1007/s11605-015-2772-9

³ de Almeida, S. M., de Menezes, F. G., Martino, M. D. V., Tachira, C. R., Toniolo, A. D. R., Fukumoto, H. L., Edmond, M. B., & Marra, A. R. (2021). Impact of a surgical safety checklist on surgical site infections, antimicrobial resistance, antimicrobial consumption, costs and mortality. The Journal of hospital infection, 116, 10–15. https://doi.org/10.1016/j.jhin.2021.05.003

 ⁴ Fudickar, A., Hörle, K., Wiltfang, J., & Bein, B. (2012). The effect of the WHO Surgical Safety Checklist on complication rate and communication. Deutsches Arzteblatt international, 109(42), 695–701. https://doi.org/10.3238/arztebl.2012.0695

⁵ Gawande, A. (2010). The Checklist Manifesto. : Profile Books LTD.

⁶ Haugen, A., Søfteland, E., Almeland, S., Sevdalis, N., Vonen, B., Eide, G., Nortvedt, M., Harthug, S. Effect of the World Health Organization Checklist on Patient Outcomes: A Stepped Wedge Cluster Randomized Controlled Trial. Annals of Surgery 261(5):p 821-828, May 2015. | DOI: 10.1097/SLA.0000000000000716

⁷ Hersch, M. (2009, July 19). The Fourth Crewmember. Smithsonian Magazine. https://www.smithsonianmag.com/air-space-magazine/the-fourth-crewmember-37046329/ 

⁸ Hyatt Regency Walkway Collapse. (n.d.). Online Ethics Center. https://onlineethics.org/print/pdf/node/44241

⁹ Kirby, T. (2010, September 25). Atul Gawande—making surgery safer worldwide [Editorial]. Perspectives, 376(9746), 1045. https://doi.org/https://doi.org/10.1016/S0140-6736(10)61473-0

¹⁰ Lifebox, Ariadne Labs. (2020, January 15). Checking In On the Checklist. Lifebox. Retrieved February 27, 2024, from https://www.lifebox.org/checkinginonthechecklist/ 

¹¹ Moller, N., Hansson, S., Holmberg, J., Rollenhagen, C. (Eds.). (2017). Handbook of Safety Principles. : John Wiley & Sons Inc.. https://doi.org/10.1002/9781119443070.ch28

¹² Reason J. (2000). Human error: models and management. BMJ (Clinical research ed.), 320(7237), 768–770. https://doi.org/10.1136/bmj.320.7237.768

¹³ Wyss, M., Kolbe, M., & Grande, B. (2023). Make a difference: implementation, quality and effectiveness of the WHO Surgical Safety Checklist-a narrative review. Journal of thoracic disease, 15(10), 5723–5735. https://doi.org/10.21037/jtd-22-1807

Lead with Truth, Improve with Insight

Lead with Truth,
Improve with Insight

References

¹ Bliss, L. A., Ross-Richardson, C. B., Sanzari, L. J., Shapiro, D. S., Lukianoff, A. E., Bernstein, B. A., & Ellner, S. J. (2012). Thirty-day outcomes support implementation of a surgical safety checklist. Journal of the American College of Surgeons215(6), 766–776. https://doi.org/10.1016/j.jamcollsurg.2012.07.015 


² Chaudhary, N., Varma, V., Kapoor, S., Mehta, N., Kumaran, V., & Nundy, S. (2015). Implementation of a surgical safety checklist and postoperative outcomes: a prospective randomized controlled study. Journal of gastrointestinal surgery : official journal of the Society for Surgery of the Alimentary Tract19(5), 935–942. https://doi.org/10.1007/s11605-015-2772-9


³ de Almeida, S. M., de Menezes, F. G., Martino, M. D. V., Tachira, C. R., Toniolo, A. D. R., Fukumoto, H. L., Edmond, M. B., & Marra, A. R. (2021). Impact of a surgical safety checklist on surgical site infections, antimicrobial resistance, antimicrobial consumption, costs and mortality. The Journal of hospital infection, 116, 10–15. https://doi.org/10.1016/j.jhin.2021.05.003


 ⁴ Fudickar, A., Hörle, K., Wiltfang, J., & Bein, B. (2012). The effect of the WHO Surgical Safety Checklist on complication rate and communication. Deutsches Arzteblatt international, 109(42), 695–701. https://doi.org/10.3238/arztebl.2012.0695


⁵ Gawande, A. (2010). The Checklist Manifesto. : Profile Books LTD.


⁶ Haugen, A., Søfteland, E., Almeland, S., Sevdalis, N., Vonen, B., Eide, G., Nortvedt, M., Harthug, S. Effect of the World Health Organization Checklist on Patient Outcomes: A Stepped Wedge Cluster Randomized Controlled Trial. Annals of Surgery 261(5):p 821-828, May 2015. | DOI: 10.1097/SLA.0000000000000716

⁷ Hersch, M. (2009, July 19). The Fourth Crewmember. Smithsonian Magazine. https://www.smithsonianmag.com/air-space-magazine/the-fourth-crewmember-37046329/ 


⁸ Hyatt Regency Walkway Collapse. (n.d.). Online Ethics Center. https://onlineethics.org/print/pdf/node/44241


⁹ Kirby, T. (2010, September 25). Atul Gawande—making surgery safer worldwide [Editorial]. Perspectives, 376(9746), 1045. https://doi.org/https://doi.org/10.1016/S0140-6736(10)61473-0


¹⁰ Lifebox, Ariadne Labs. (2020, January 15). Checking In On the Checklist. Lifebox. Retrieved February 27, 2024, from https://www.lifebox.org/checkinginonthechecklist/ 


¹¹ Moller, N., Hansson, S., Holmberg, J., Rollenhagen, C. (Eds.). (2017). Handbook of Safety Principles. : John Wiley & Sons Inc.. https://doi.org/10.1002/9781119443070.ch28


¹² Reason J. (2000). Human error: models and management. BMJ (Clinical research ed.), 320(7237), 768–770. https://doi.org/10.1136/bmj.320.7237.768


¹³ Wyss, M., Kolbe, M., & Grande, B. (2023). Make a difference: implementation, quality and effectiveness of the WHO Surgical Safety Checklist-a narrative review. Journal of thoracic disease, 15(10), 5723–5735. https://doi.org/10.21037/jtd-22-1807

SST logo

Surgical Safety Technologies Inc.

One World Trade Center, New York, NY 10007, USA

20 Queen St W, Toronto, ON M5H 3R3, Canada

Youtube Logo

© 2026 Surgical Safety Technologies, Inc. All Rights Reserved.

SST logo

Surgical Safety Technologies Inc.

One World Trade Center, New York, NY 10007, USA

20 Queen St W, Toronto, ON M5H 3R3, Canada

Youtube Logo

© 2026 Surgical Safety Technologies, Inc.

All Rights Reserved.

SST logo

Surgical Safety Technologies Inc.

One World Trade Center, New York, NY 10007, USA

20 Queen St W, Toronto, ON M5H 3R3, Canada

Youtube Logo

© 2026 Surgical Safety Technologies, Inc. All Rights Reserved.

Complex Systems Need Layered Protection