Buffer

A buffer is deliberate slack placed between variation and a commitment. It gives a workflow room to absorb normal disturbance without turning every small variation into delay.

In brief

Buffers are often mistaken for waste. In reality, a workflow with no buffer is brittle. A small variation in input, time, priority or availability immediately damages the promise made downstream.

A useful buffer is not hidden slack. It is visible, intentional and reviewed.

Operational definition

A buffer can protect time, capacity, inventory, attention or decision space.

The logic is always the same: variation exists, and the system needs a designed place to absorb it before it reaches the commitment.

A buffer is useful when it protects the right point. It becomes waste when nobody knows what it protects.

Why it matters for SMEs

SMEs often run close to the limit because resources are scarce. That can look efficient until a small disturbance creates a large delay.

When every role is fully loaded, there is no room for exceptions. When every delivery date is planned on the best case, normal variation becomes emergency. When every decision queue is full, attention disappears.

Buffers protect the system from normal variation.

Observable signals

Look for small disturbances creating large delays.

Look for work that can proceed only when everything goes perfectly.

Look for hidden early starts used to protect later promises.

Look for people keeping private reserves of time or information.

Look for commitments missed because no slack existed where variation appeared.

Common mistakes

Treating all slack as inefficiency.

Hiding buffers instead of designing them.

Placing the buffer far from the real source of variation.

Increasing buffers without reducing the variation that consumes them.

Operational example

A company promises dates using ideal processing time. Any missing input creates delay. People compensate by starting work earlier than needed, which increases WIP.

The company introduces a visible planning buffer and a simple WIP rule. The flow becomes easier to read because the buffer is no longer hidden inside early starts.

Diagnostic questions

What variation regularly hits this flow?

What commitment must be protected?

Where is the current buffer, visible or hidden?

What happens when the buffer is consumed?

Can the source of variation be reduced?

Practical implications

Name the buffer type. Place it where variation meets commitment. Review how often it is consumed. Do not remove a buffer before understanding what it was absorbing.

MARTRO reading

In MARTRO’s reading, buffers are structural protection. They preserve flow, attention and optionality under variation.

The same logic applies to time, WIP, capacity and cognitive margin.

Frequently asked questions

Is a buffer waste? Not if it protects a real commitment from normal variation.

Where should a buffer sit? Near the point where variation would damage the flow or the promise.

Can buffers hide problems? Yes. That is why their use should be visible.

What is a cognitive buffer? Attention left available for interpretation, decisions and change.

Should buffers be reduced? Only after the variation they absorb has been reduced or redesigned.