The concept of the “SCO as a behavioural space” fundamentally changes how we understand self-checkout systems.
Self-checkout systems have long become part of everyday retail operations.
In more and more stores, customers are now performing tasks that were previously handled exclusively by checkout staff: scanning items, registering products, paying and leaving the store.
The advantages are obvious:
- greater flexibility
- better scalability
- shorter waiting times
- more efficient processes
However, the growing use of self-checkout systems is not only changing the checkout process itself.
It is also changing human behaviour.
And this is something the retail industry still discusses far too little.
Shrinkage Does Not Happen by Accident
In my article “An Open Door May Even Tempt a Saint!” (see also https://dr-rainer-eckert.de/en/inventory-losses-germany-2024-retail-shrinkage/), I explained how strongly shrinkage is influenced by situational behaviour.
Let us take another look at the latest EHI figures for 2024 (see also https://www.ehi.org/wp-content/uploads/Downloads/Leseproben/EHI-Studie_Inventurdifferenzen_2025_Leseprobe.pdf):
- €4.95 billion in shrinkage within the German retail sector
- of which €2.95 billion was caused by customers
- and a further €0.89 billion by employees
At the same time, according to EHI, there were in 2024:
- around 930,000 checkout systems in Germany overall
- but only approximately 20,000 self-checkout systems
This means that SCOs currently account for only around two percent of all checkout systems.
Even with the continued expansion of self-checkout technology, the share of SCO systems is expected to reach only around three percent by 2026.
At first glance, one might therefore conclude:
The impact of SCOs on overall retail losses is still comparatively limited today.
But this is exactly where the misconception begins.
Why the SCO as a Behavioural Space Changes the Dynamics
According to EHI estimates, the theft rate at self-checkout systems is around 15 to 30 percent higher than at traditional staffed checkouts.
And this fundamentally changes the dynamics.
Because with every additional SCO, it is not only the number of systems that increases.
The risk of shrinkage and losses grows disproportionately as well.
Or to put it another way:
The share of losses grows faster than the share of technology.
The crucial question therefore is:
Why is this happening?
The simple answer:
Because behaviour changes.
People Behave Differently Towards Technology
At traditional staffed checkouts, people interact with people.
At self-checkout systems, people primarily interact with technology.
At first glance, this may sound trivial. However, the psychological consequences are significant.
Because perceptions, inhibitions and justification patterns often change.
Typical effects may include:
- lower inhibitions
- actions being perceived differently (“I am only tricking the system.”)
- accidental behaviour becoming habit
- habit eventually turning into intent
This is precisely why a purely technical view of self-checkout systems falls short.
An SCO is not simply a piece of furniture equipped with a scanner, screen and payment module.
It is a behavioural space.
The Key Question Is Not: “How Can We Control This Better?”
Many discussions about self-checkout revolve around control:
- more cameras
- more sensors
- more AI
- better fraud detection
- smarter exit systems
All of these technologies are important.
But they do not automatically solve the underlying problem.
Because the key question is not:
“How can we control this space better?”
But rather:
“What kinds of behaviour does this system create — and how do we influence it?”
The concept of the “SCO as a behavioural space” helps us to view self-checkout zones not only from a technical perspective, but also from a psychological one.
This is exactly where self-checkout becomes far more than just a technology project.
It becomes a question of:
- psychology
- behavioural patterns
- ergonomics
- user guidance
- store design
- visibility and presence
- perception
- situational conditions
The Three-Group Model Helps Explain the Situation
A useful framework is the well-known three-group model:
- some customers are fundamentally honest
- some are fundamentally willing to offend
- the majority react situationally
And it is precisely this situational majority that determines whether a system remains stable or becomes problematic.
The logical consequence for SCO zones must therefore be:
- minimise opportunities
- make detection risks visible
- maintain visible staff presence
- design intuitive processes
- reduce uncertainty
- consider psychological effects
Because:
“Opportunity makes thieves” is not a moral problem. It is a systemic one.
Behaviour Is the Result of Conditions
Self-checkout zones actively shape behaviour.
With every layout.
With every user interface.
With every technical decision.
With every operational process.
Behaviour does not emerge randomly.
It is the result of conditions and framework design.
And this is exactly why SCO zones must be considered holistically — technically, organisationally and psychologically.
Today, the influence of many SCO systems on overall retail losses may still appear limited.
But with every additional system, their impact grows.
The real question is therefore no longer whether retail companies should engage with these topics.