HOP Series: Chapter 4 – To Error is Human 

This summary from The 5 Principles of HOP by Adilson Monteiro, along with the Annex on SRK Theory: Human Error (Rasmussen) explores Monteiro’s core message that human error is an inherent, predictable part of human performance, not a moral failing or a sign of incompetence. The chapter reframes error as a symptom of deeper system conditions, not the cause of events. 

Central Idea 

People will make mistakes even when they are skilled, motivated, and attentive. The role of leaders and organizations is to design systems that anticipate, absorb, and learn from error, rather than punish it. 

How Monteiro Frames Human Error 

1. Error as a Normal Byproduct of Work 

  • Humans operate with limited attention, memory, and processing capacity. 
  • Variability in performance is natural and unavoidable. 
  • Error rates increase under pressure, fatigue, complexity, and ambiguity. 

Monteiro emphasizes that expecting zero errors is a design flaw, not a performance expectation. 

2. Blame Prevents Learning 

  • Blame focuses attention on the last person who touched the system. 
  • It obscures the upstream conditions that shaped the error. 
  • Workers’ actions make sense to them in the moment, given the context they faced. 

This aligns with modern safety science: blame is a barrier to understanding. 

3. Context Drives Behaviour 

Monteiro stresses that workers’ decisions are shaped by: 

  • Production pressure 
  • Resource constraints 
  • Conflicting goals 
  • Ambiguous procedures 
  • Organizational norms 
  • Tool and equipment design 

Errors often reflect systemic drift, not individual negligence. 

4. Leaders Shape the Error Landscape 

Leaders influence: 

  • How work is designed 
  • How risk is communicated 
  • How learning occurs 
  • How people respond to uncertainty 

A punitive culture increases hiding, fear, and workarounds. 
A learning culture increases reporting, transparency, and system improvement. 

5. The Purpose of HOP Is Not to Eliminate Error 

Instead, HOP aims to: 

  • Reduce the consequences of error 
  • Strengthen defenses and recovery mechanisms 
  • Improve system resilience 
  • Encourage learning from normal work, not just incidents 

Monteiro reinforces that error is data, not a defect. 

Practical Implications for Organizations 

✔ Build systems that expect error 

Design work so that a single slip cannot cause catastrophic harm. 

✔ Strengthen capacity, not control 

Focus on barriers, recovery, and resilience—not tighter rules. 

✔ Treat workers as problem solvers 

They are the experts in how work is done. 

✔ Investigate context, not character 

Ask: “Why did this make sense to them at the time?” 

✔ Create psychological safety 

People must feel safe to report mistakes and weak signals. 

Annex – SRK Theory: Human Error (Rasmussen) 

Rasmussen’s SRK model explains three levels of human performance and the types of errors associated with each. Monteiro includes this annex to give leaders a practical framework for understanding why errors occur. 

The SRK Model 

1. Skill Based Performance 

Automatic, routine actions performed with little conscious attention. 
Error type: Slips and lapses 

  • Slips = wrong action 
  • Lapses = missed action 

These occur when attention is diverted, fatigued, or overloaded. 

2. Rule Based Performance 

Applying stored rules or procedures to familiar situations. 
Error type: Misapplication of rules 

  • Using the wrong rule 
  • Applying a rule incorrectly 
  • Following a rule that doesn’t fit the situation 

Often triggered by ambiguous cues or poorly designed procedures. 

3. Knowledge Based Performance 

Used in unfamiliar, novel, or high uncertainty situations. 
Error type: Reasoning mistakes 

  • Incorrect problem-solving 
  • Wrong mental models 
  • Overconfidence in assumptions 

These errors arise when workers must improvise without adequate information or support. 

Why Rasmussen’s Model Matters for HOP 

It shifts focus from “who erred” to “what mode they were forced into. 

Workers often move from skill based to knowledge-based performance when: 

  • Conditions change 
  • Procedures don’t match reality 
  • Tools fail 
  • Time pressure increases 

This shift increases cognitive load and error likelihood. 

It helps leaders diagnose system weaknesses 

For example: 

  • Frequent slips → fatigue, distraction, poor interface design 
  • Frequent rule errors → unclear procedures, conflicting rules 
  • Frequent knowledge-based errors → inadequate training, unpredictable work environments 

It reinforces that error is predictable and manageable 

By understanding performance modes, organizations can design better: 

  • Interfaces 
  • Procedures 
  • Training 
  • Workflows 
  • Barriers 

Integrated Takeaway 

Monteiro’s chapter and Rasmussen’s SRK annex combine into a single message: 

Human error is not the problem—system design, context, and organizational response are the real levers of safety. 

Error is: 

  • Normal 
  • Predictable 
  • Influenced by context 
  • A source of learning 
  • A signal of system conditions 

HOP’s role is to build systems that expect error and prevent it from becoming harm.