Human Factors Engineering

The Dirty Dozen – 12 Human Factors That Threaten Aviation Safety In aviation, even the smallest mistake can have massive consequences. That’s why safety isn’t just about machines—it’s about people. The “Dirty Dozen” refers to 12 human factors identified by aviation experts that commonly contribute to errors and accidents in aircraft maintenance and operations. Let’s break them down: 1. Lack of Awareness – Not fully understanding what’s happening around you can lead to missed details and serious mistakes. 2. Norms – “This is how we always do it” can be dangerous if procedures are outdated or wrong. 3. Lack of Communication – Poor handovers, unclear messages, or missing information can lead to confusion and errors. 4. Complacency – Getting too comfortable or overconfident can cause you to overlook important steps. 5. Lack of Knowledge – Incomplete training or unfamiliarity with equipment can put everyone at risk. 6. Distractions – Even small interruptions during critical tasks can lead to overlooked steps or incorrect actions. 7. Lack of Teamwork – When teams don’t cooperate effectively, mistakes are more likely to slip through. 8. Fatigue – Tired minds and bodies don’t function well. Long hours and lack of rest impair judgment and performance. 9. Lack of Resources – Missing tools, parts, time, or staff can force people to cut corners. 10. Pressure – Tight deadlines or external expectations can push individuals to rush or take unsafe shortcuts. 11. Lack of Assertiveness – When someone doesn’t speak up about concerns, problems can go unaddressed. 12. Stress – Personal or job-related stress can distract and reduce concentration, leading to poor decisions. Why it matters: In aviation, there’s no room for error. Each of these factors has contributed to real incidents in the past. Recognizing and addressing them can prevent accidents, save lives, and ensure operations run smoothly. Who should care? This isn’t just for pilots or engineers—anyone working in aviation, maintenance, safety, or logistics needs to understand the Dirty Dozen. Even professionals in healthcare, manufacturing, or construction can relate to these risk factors. Be alert. Be aware. Be accountable. The skies are safer when we all take responsibility.

Want to improve safety? Start by understanding people — not just procedures. In high-risk work environments, we often focus on systems, compliance, and controls. But it’s human factors that often decide whether things go right… or terribly wrong. Human factors in safety isn’t about blaming the person — it’s about understanding the person: What are they seeing, hearing, and feeling? Are they fatigued, rushed, or under pressure? Is the task designed for success, or primed for error? When we design work with human performance in mind, we move from: ❌ “Who made the mistake?” ✅ To: “What conditions set the stage for it?” Human factors means: Clear, intuitive procedures Fit-for-purpose tools and environments Mental workload and stress considered in planning Control room and field tasks aligned with real-world use Teams trained in decision-making under pressure Because safety isn’t just technical — it’s human. If we want fewer incidents, we need to understand the people doing the work. That’s how we design for safety, not just hope for it. #HumanFactors #SafetyCulture #HumanPerformance #WorkplaceSafety #HSE #SafetyLeadership #HumanCentredDesign #HighReliability #ErrorPrevention #OperationalExcellence

Human error is not the cause… it’s the consequence. We often rush to blame people after incidents: “Why didn’t he follow the procedure?” “Why did she ignore the rule?” But modern safety science tells a different story: When unsafe behavior is repeated, the system "not the person" is usually at fault. Think of a work system that assumes: • The worker never gets tired • Never gets distracted • Always reads instructions • Always makes rational decisions That’s not a system, that’s a fantasy. In the real world? Fatigue, pressure, uncertainty, and repetition are always in play. Poorly designed systems create human error. Well-designed systems reduce the chances of it. Today’s safety thinking embraces the principle of “Designing for Human Error” building procedures and controls that: • Align with human limitations • Reduce complexity • Detect mistakes before they escalate Here’s the truth: Don’t overload the worker. Design the system to support them, not to test them. #SafetyScience #HumanFactors #SafetyByDesign #HSE #LeadershipInSafety #RiskEngineering #NEBOSH #SystemsThinking

In Human Error (1990), the late James Reason offers a deep dive into the psychology of human mistakes. Over three decades later, his insights remain relevant, whether you're dealing with medical errors, AI design, or aviation safety. Here are a few lessons I took away: Errors happen on three levels 1. Skill-based (slips/lapses); routine actions gone wrong; 2. Rule-based; applying the wrong rule to a familiar situation; 3. Knowledge-based; flawed reasoning in unfamiliar territory. Cognitive underspecification When situations are unclear, our brain defaults to what seems to fit; “I did it automatically.” These automatic processes, similarity-matching and frequency-gambling, are incredibly efficient but also prone to failure. The ‘fallible machine’ If you build a thinking machine that works like the human brain, it will also make human-like mistakes. Reason’s simulations show that our brain relies on smartly organized, but occasionally error-prone, knowledge networks. Error detection: easier said than done We quickly correct low-level errors, like posture or speech. But at higher levels, like planning and reasoning, errors are much harder to spot. Timely and high-quality feedback is important. Disasters rarely stem from a single error The greatest risks come from latent errors in systems; poor design, weak training, flawed decision-making. For instance, Chernobyl, Bhopal, or Challenger weren’t single catastrophic mistakes, but accumulations of small, hidden failures. How do we reduce risk? - Error-tolerant design; - Intelligent decision support; - Awareness of error traps in systems and workflows. Reason ends on a sobering note, when he writes that not all risks can be eliminated, especially those emerging from group dynamics and organizational structures. Human error is a byproduct of how our brain normally works. Understanding this is important to building safer systems, better designs, and collaboration. Reason, J. (1990), Human Error, New York: Cambridge University Press #JamesReason #HumanFactors #CognitiveScience #SystemDesign

✈️ Human Factors don’t fail. People do — under pressure. This is one of the core ideas I develop in my book on Human Factors in Aviation, built on years of real operational experience, not classroom theory. In aviation, most events don’t happen because of lack of knowledge. They happen because of how humans operate in real conditions. 🧠 Fatigue that is “manageable” ⏱️ Time pressure that becomes normal 🗣️ A doubt that remains unspoken 📋 A procedure followed without thinking 💬 A communication assumed, not confirmed Nothing breaks suddenly. Safety erodes one decision at a time. Human Factors are not about blaming people. They are about understanding how good professionals make poor decisions when context, workload, stress, and expectations align. Talking about Human Factors is not academic. It’s operational. It’s prevention. ✈️ The question is not whether Human Factors are present. 👉 The question is whether we manage them — or react only when it’s already too late. #HumanFactors #AviationSafety #OperationalDecisionMaking #CRM #DRM #SafetyCulture

Human Factors: The Real Safety System in the Cockpit Modern aircraft are incredibly advanced — but human performance still defines safety. For pilots, understanding Aviation Human Factors isn’t academic. It’s operational. Key components every pilot should actively manage: 🔹 The Pilot (Human Performance) Fatigue, stress, situational awareness, workload, and decision-making. Knowing your limits is as important as knowing the aircraft. 🔹 Aircraft & Automation Mode awareness, automation management, and maintaining manual flying proficiency. Always know what the aircraft is doing — and why. 🔹 Operating Environment Weather, terrain, airspace complexity, time pressure, and operational demands all shape pilot performance. 🔹 Procedures & SOPs Checklists, standard callouts, and task sharing exist to reduce error — especially when workload is high. 🔹 Crew Resource Management (CRM) Clear communication, assertiveness, leadership, and managing authority gradients. Good CRM turns a crew into a safety net. 🔹 Threat & Error Management (TEM) Anticipating threats, detecting errors early, and recovering before they escalate into unsafe situations. Human factors aren’t theory. They influence every decision we make on the flight deck — on every flight. What human factor do you think pilots underestimate the most? #Aviation #HumanFactors #AviationSafety #PilotLife #CRM #FlightDeck #training

⏳ Late Human Factors = months/years lost + millions spent 💵 Over the next few weeks, I’ll be sharing personal, real-world examples of why integrating #HumanFactors earlier leads to: - more intuitive, safe, and effective devices - meaningful time and cost savings - successful regulatory submissions Over the last decade, I’ve seen many companies only consider HF at the V&V stage 💔 1️⃣ A pre-summative study reveal the need for an entirely new training programme 2️⃣ A validation fail because the user interface didn’t adequately consider colour-blind users 3️⃣ A validation study uncover a mechanical failure that should have been caught during verification 4️⃣ An FDA pre-sub meeting confirm that simulated use alone wasn’t sufficient. Actual-use testing was required 5️⃣ Two rapid formative studies + ongoing expert HF reviews (over five months) cut six months off the development timeline (earlier validation confidence, faster submission, investor timelines met) 6️⃣A device that was intuitive by design become less usable once the IFU was used All examples will be shared in an anonymised way, with full respect for client and device confidentiality. Stay tuned! My hope is this encourages more teams to integrate Human Factors earlier and throughout development, when it can have the greatest impact ❤️

To me, UX is nothing but the psychology of people interacting with their environment, including products and services, studied across multiple levels, from individuals to groups. UX is not a toolset, role title, or a checklist of methods. It is a way of understanding human behavior in designed systems, unfolding over time and shaped by context, constraints, and social dynamics. That is why learning UX is not about mastering Figma, running a few usability tests, or memorizing heuristics. Those are execution skills. The foundation lives elsewhere. I believe, if you want to truly learn UX, these are the fields you need to study: 1️⃣ Cognitive psychology. This is the backbone of UX. Perception, attention, memory, mental models, decision-making, learning, and cognitive load explain why users behave the way they do and why many designs fail even when they look clean. Cognitive Psychology: Connecting Mind, Research, and Everyday Experience, by E. Bruce Goldstein, Greg Francis, Ian Neath, 5th Edition https://lnkd.in/gy8vWpN9 2️⃣ Human factors and ergonomics. UX is about fitting systems to humans, not humans to systems. Human factors teaches you how physical, cognitive, and environmental constraints shape interaction, error, fatigue, and performance. Introduction to Human Factors and Ergonomics, 5th Edition by R S Bridger https://lnkd.in/gmxqJU7k 3️⃣ Behavioral science and decision science. People do not behave rationally. Biases, heuristics, habits, and context drive real behavior. If you ignore this, your designs will look logical on paper and fail in the real world. Thinking, Fast and Slow, by Daniel Kahneman https://lnkd.in/gZgzzRuF 4️⃣ Qualitative research methods. Interviewing, observation, diary studies, and thematic analysis are not soft skills. They are structured methods for uncovering meaning, motivation, and breakdowns that metrics alone cannot reveal. Qualitative Research Methods for Psychologists - Constance T. Fischer  https://lnkd.in/gK4aWQvy 5️⃣ Quantitative methods and statistics. If you cannot measure behavior, variability, and uncertainty, you cannot make defensible decisions. UX is full of noisy, small, messy data. Knowing how to analyze it properly is a core skill, not a bonus. Handbook of Statistical Modeling for the Social and Behavioral Sciences - Arminger, Clogg, Sobel https://lnkd.in/gT5tcKSu Finally, domain knowledge. Healthcare UX is not fintech UX. Games are not enterprise tools. UX does not exist in a vacuum. You must understand the domain you are designing for. The biggest mistake I see is treating UX as a design specialization. At its core, UX is applied psychology in complex systems.

Ever wonder what “Human Factors” is? I often get questions about it (my PhD is in Human Factors). In a nutshell, HF is the science behind designing systems – like websites, apps, or even airplane cockpits – to perfectly fit the way humans interact with them. It's a broad field that's been around for decades, and it's had a major influence on UX research as we know it today. Human factors, human-computer interaction, and user experience are three closely related fields. Here’s a quick breakdown: • HF: Established during WWII, it focuses on human interaction with various systems, not just computers. This includes car dashboards, medical devices, and more. • HCI: A subfield of HF that emerged in the 1980s with the rise of personal computers. Its focus is more academic, specifically on designing and evaluating how we use computer systems. • UX: The most recent of the three (coined in the 1990s), UX centers on creating smooth and enjoyable experiences for users interacting with digital interfaces. Want to drill deeper?

✈️ New Publication Alert! ✈️ Excited to share my latest work, “Enhancing Flight Deck Resilience and Optimizing Risk Mitigation: A Sociotechnical Approach,” now published in Human Factors in Design, Engineering, and Computing as part of the AHFE 2024 International Conference proceedings. This paper explores the flight deck as a sociotechnical system, emphasizing the critical role of socio-processing capacity—the cognitive, affective, communicative, and collaborative abilities pilots use to manage information, coordinate with their crew, and make informed decisions. One key finding: when the flight deck environment lacks psychological safety, pilots are more likely to self-silence, shifting away from open communication. This directly impacts the effectiveness of safety models like Threat and Error Management (TEM). The research highlights how fostering psychological safety and enhancing interpersonal skills can strengthen collaboration, bolster resilience, and ultimately reduce risks in the flight deck. Check out the full paper here: https://lnkd.in/g2TRH2Ca. I’d love to hear your thoughts on how we can continue to innovate for safer skies! 🚀 #AviationSafety #HumanFactors #SociotechnicalSystems #PsychologicalSafety #AHFE2024