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A checklist contains three sections, titled “Sign in,” “Time out,” and “Sign out.” The section titled “Sign in” begins, “Before induction of anesthesia, members of the team (at least the nurse and an anesthesia professional) orally confirm that.” A bulleted list below this text contains four items. The first list item reads, “The patient has verified his or her identity, the surgical site and procedure, and consent.
The surgical site is marked or site marking is not applicable.
The pulse oximeter is on the patient and functioning.” The second list item reads, “All members of the team are aware of whether the patient has a known allergy.” The third list item reads, “The patient’s airway and risk of aspiration have been evaluated and appropriate equipment and assistance are available.” The fourth list item reads, “If there is a risk of blood loss of at least 500 ml (or 7 ml/kg of body weight, in children), appropriate access and fluids are available.” The section titled “Time out” begins, “Before skin incision, the entire team (nurses, surgeons, anesthesia professionals, and any others participating in the care of the patient) orally.” The bulleted list below contains “Confirms that all team members have been introduced by name and role. Confirms the patient’s identity, surgical site, and procedure. Reviews the anticipated critical events.” This first bullet has three sub-bullets that read, “Surgeon reviews critical and unexpected steps, operative duration, and anticipated blood loss; Anesthesia staff review concerns specific to the patient; Nursing staff review confirmation of sterility, equipment availability, and other concerns.” The following two bullets read: Confirms that prophylactic antibiotics have been administered = 60 min before incision is made or that antibiotics are not indicated” and “Confirms that all essential imaging results for the correct patient are displayed in the operating room.” The section titled “Sign out” reads “Before the patient leaves the operating room.” Following this are two bullet points. The first reads “Nurse reviews items aloud with the team.” This bullet has four sub-bullets that read “Name of the procedure as recorded; That the needle, sponge, and instrument counts are complete (or not applicable); That the specimen (if any) is correctly labeled, including with the patient’s name; Whether there are issues with equipment to be addressed.” The final bullet reads “The surgeon, nurse, and anesthesia professional review aloud the key concerns for the recovery and care of the patient.”
Checklists, such as the WHO surgical checklist shown here, help reduce workplace accidents.

Safety concerns also lead to limits to how long an operator, such as a pilot or truck driver, is allowed to operate the equipment. Recently the Federal Aviation Administration (FAA) introduced limits for how long a pilot is allowed to fly without an overnight break.

Howell (2003) outlines some important areas of research and practice in the field of human factors. These are summarized in [link] .

Areas of study in human factors psychology
Area Description I-O Questions
Attention Includes vigilance and monitoring, recognizing signals in noise, mental resources, and divided attention How is attention maintained? What about tasks maintains attention? How to design systems to support attention?
Cognitive engineering Includes human software interactions in complex automated systems, especially the decision-making processes of workers as they are supported by the software system How do workers use and obtain information provided by software?
Task analysis Breaking down the elements of a task How can a task be performed more efficiently? How can a task be performed more safely?
Cognitive task analysis Breaking down the elements of a cognitive task How are decisions made?

As an example of research in human factors psychology Bruno&Abrahão (2012) examined the impact of the volume of operator decisions on the accuracy of decisions made within an information security center at a banking institution in Brazil. The study examined a total of about 45,000 decisions made by 35 operators and 4 managers over a period of 60 days. Their study found that as the number of decisions made per day by the operators climbed, that is, as their cognitive effort increased, the operators made more mistakes in falsely identifying incidents as real security breaches (when, in reality, they were not). Interestingly, the opposite mistake of identifying real intrusions as false alarms did not increase with increased cognitive demand. This appears to be good news for the bank, since false alarms are not as costly as incorrectly rejecting a genuine threat. These kinds of studies combine research on attention, perception, teamwork, and human–computer interactions in a field of considerable societal and business significance. This is exactly the context of the events that led to the massive data breach for Target in the fall of 2013. Indications are that security personnel received signals of a security breach but did not interpret them correctly, thus allowing the breach to continue for two weeks until an outside agency, the FBI, informed the company (Riley, Elgin, Lawrence,&Matlack, 2014).

Summary

Human factors psychology, or ergonomics, studies the interface between workers and their machines and physical environments. Human factors psychologists specifically seek to design machines to better support the workers using them. Psychologists may be involved in design of work tools such as software, displays, or machines from the beginning of the design process or during the testing an already developed product. Human factor psychologists are also involved in the development of best design recommendations and regulations. One important aspect of human factors psychology is enhancing worker safety. Human factors research involves efforts to understand and improve interactions between technology systems and their human operators. Human–software interactions are a large sector of this research.

Personal application

Describe an example of a technology or team and technology interaction that you have had in the context of school or work that could have benefited from better design. What were the effects of the poor design? Make one suggestion for its improvement.

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Source:  OpenStax, Psychology. OpenStax CNX. Feb 03, 2015 Download for free at https://legacy.cnx.org/content/col11629/1.5
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