Attribution Theory, the Substitution Test, and Smarter Culpability Decisions

In safety management, how we explain behavior matters.

When an event occurs, whether it is a missed checklist step, a ground handling error, or a deviation from procedure, our first instinct is often to look at the individual involved. What were they thinking? Why didn’t they follow the process? Were they careless?

But decades of psychological research suggest something important. Humans are not very accurate when attributing the causes of other people’s behavior. More often than not, we overemphasize internal causes, meaning the person, and underemphasize external causes, meaning the system.

This is where attribution theory becomes highly relevant to Safety Management Systems.

What Is Attribution Theory?

Attribution theory examines how people explain behavior, both their own and others’.

There are two broad types:

• Intrapersonal attribution. How we explain our own behavior.

• Interpersonal attribution. How we explain someone else’s behavior.

  
  

In SMS, we are primarily concerned with interpersonal attribution. How do we determine whether an unsafe act was driven by the individual or by the environment, systems, policies, or culture surrounding them?

Research shows we have a built-in bias. When evaluating others, we tend to attribute behavior to internal factors such as attitude, carelessness, or motivation rather than external factors such as time pressure, unclear procedures, system design, or leadership influences.

That tendency has shaped aviation for decades and often made blame the path of least resistance.

The Substitution Test in Just Culture

Many organizations use a just culture framework with a culpability algorithm. A common component is the substitution test.

The substitution test asks a simple question. If another qualified individual had been placed in the same situation, would they likely have acted the same way?

If the answer is yes, we lean toward system influence.

If the answer is no, we lean toward individual accountability.

The substitution test primarily evaluates consensus, which is whether others would behave similarly under the same conditions. Attribution research suggests we should look at more than just that one dimension.

The Three Dimensions That Shape Attribution

Research identifies three key pieces of information people use when attributing causes to behavior:

1. Distinctiveness

   Does this individual behave this way across different types of situations?

2. Consensus

   Do others behave the same way in the same or similar situation?

3. Consistency

   Does this individual behave the same way in similar situations over time?

   
   

These three dimensions influence whether we interpret behavior as system driven or person driven.

When Behavior Is Attributed to External Factors

Research shows that when all three dimensions are high, we tend to attribute behavior to external causes.

Consider a ground handling example.

The individual misses a checklist step not only in this case but in other types of tasks. That indicates high distinctiveness. Other team members also miss checklist steps under similar conditions. That indicates high consensus. In similar situations, such as high tempo operations or environmental stress, the same error occurs repeatedly. That indicates high consistency.

When those three conditions are present, observers tend to conclude that something about the system is contributing to the behavior.

This could point to checklist design, workload, environmental pressures, supervision, or process clarity.

When Behavior Is Attributed to Internal Factors

Now consider a different pattern:

• Distinctiveness is low. The person does not behave this way in other contexts.

• Consensus is low. Others do not make this mistake in the same situation.

• Consistency is high. This individual repeatedly makes the same error in similar situations.

Research shows we tend to attribute this type of pattern to internal causes such as training gaps, skill issues, knowledge deficiencies, or individual decision-making patterns.

Attribution theory does not eliminate accountability. It helps us calibrate it more accurately.

Why This Matters for SMS

If your organization relies only on the substitution test, you are primarily evaluating consensus. You may be missing valuable insight from distinctiveness and consistency.

A more robust review process might consider:

• How does this individual perform in other operational contexts?

• Do others show similar behavior under similar pressures?

• Is this a one-time deviation or a pattern across time?

  
  

Adding these dimensions strengthens objectivity and reduces the risk of unconscious bias in culpability decisions.

Guarding Against Attribution Bias

Even with structured processes, we must acknowledge a fundamental truth. Attribution is inherently subjective.

Without formal algorithms, objective review committees, and standardized procedures, we are more likely to default to internal blame.

This does not mean every action is a symptom of the system. Some behaviors are reckless or negligent. However, research consistently shows we tend to over-attribute to internal causes and under-attribute to external ones.

A mature safety culture actively resists that instinct.

Moving Beyond Blame

Safety Management Systems are not just about compliance or documentation. They are about people, behavior, and organizational dynamics.

If we want to strengthen just culture, improve learning, and make smarter accountability decisions, we must:

• Recognize our natural attribution bias.

• Use structured and objective review processes.

• Consider distinctiveness, consensus, and consistency, not just substitution.

• Resist the simplicity of blame in favor of deeper system understanding.

  
  

Attribution theory gives us a lens. SMS gives us a structure. Together, they help us make better decisions, fairer decisions, and ultimately safer ones.