When setting up and converting vehicle production lines, everything is focused on the system ramp-up, but the critical phase before this is often underestimated.

The following applies:

The ramp-up is only the consequence.

The pre-ramp-up is the cause.

What the pre-ramp-up really is (and what it is not)

The pre-ramp-up is often seen as a "test phase". This falls short.

In reality, it is a systematic preparation for instability.

Because it is precisely this instability that awaits you in the ramp-up. Whether it's incomplete data, unstable processes, high dynamics or increasing pressure - there are many challenges to overcome during ramp-up.

The pre-ramp-up therefore has a clear goal:

👉 To make risks visible before they take effect

Why the pre-ramp-up is crucial

Research and practice show that ramp-ups consist of three clear phases:

1. Preparation (pre-ramp-up)
2. Ramp-up
3. Transition to series

And it is precisely the first phase that is often underestimated.

At the same time:

The less experience there is in the system, the higher the error rate in the system ramp-up.

This means

If you don't work cleanly in the pre-ramp-up, you are simply postponing the uncertainty.

The actual task: reducing risks

The pre-ramp-up is not a checklist. It is a process for reducing uncertainty.

Typical questions:

• Which processes are not yet stable?
• Where is reliable data missing?
• Which dependencies are critical?
• Which risks are not yet understood?

The goal is not perfection, the goal is controllability.

The biggest mistake: individual tests instead of understanding the system

Many projects test individual systems, processes and functions in the pre-ramp-up, but the decisive factor is overlooked: The system as a whole has never been tested.

This creates the following problem:

Simulations show that local changes in production systems often have an impact on the overall system that is difficult to predict without a system-wide view (see Simulation in Manufacturing Systems).

👉 This is precisely where the problems arise later in the ramp-up.

Why simulation is a real game changer

Simulations are a key lever in pre-ramp-up.

Why?

Because they make it possible to identify bottlenecks early on, analyze material flows, understand system behavior and test decisions in advance.

Simulation helps with one question in particular: What happens when everything runs simultaneously?

And that is precisely the reality of ramp-up.

Supply chain: the underestimated part of the pre-ramp-up

Many projects focus on production and forget about the supply chain.

Research clearly shows that the performance of ramp-ups depends to a large extent on the integration of suppliers and project partners (see Terwiesch et al.).

Typical problems in the supply chain include missing parts, fluctuating quality and unstable delivery times.

👉 These problems do not arise during ramp-up. They only become visible there.

Understand pre-ramp-up as a learning phase

One crucial point is:

👉 Pre-ramp-up = learning process

Studies show that successful ramp-ups depend heavily on continuous improvement, integration and close collaboration (see Procedia CIRP).

This means

• test
• analyze
• adapt
• test again

👉 Not once - but iteratively.

The 5 decisive levers in the pre-ramp-up

Now it's getting specific. The following five levers of the pre-ramp-up contribute significantly to its success.

1. consider the system instead of individual parts

The question should not be: "Does the system work?"

But rather:

👉 "Does the overall system work under real conditions?"

2. targeted use of simulation

Through the targeted use of simulations, for example for bottleneck analyses, running through various scenarios and testing load situations, assumptions can be replaced by findings.

3. integrate the supply chain

Without a stable supply chain, there is no stable ramp-up. It is therefore important to involve suppliers early on in the pre-ramp-up, to test material availability and to take fluctuations into account.

This can minimize risks at an early stage and make the ramp-up more reliable.

4. consolidate the database

A strong database is created through uniform information, up-to-date data and clear transparency. The earlier the project's database is consolidated, the more clearly the project can be managed.

5. actively manage risks

Always reacting to challenges and risks means always being at least one step behind. By identifying risks at an early stage, understanding the effects and defining measures, the project can be optimally prepared.

The economic reality

Many try to shorten the pre-ramp-up - because it brings "no direct output".

This is a mistake.

Because: the pre-ramp-up determines the costs of the ramp-up.

More preparation = less chaos

Conclusion: The ramp-up begins before the ramp-up

The biggest mistake in project management:

The ramp-up starts with production.

The reality:

👉 It starts in the pre-ramp-up.

This is where it is decided how stable processes are, how transparent the project is and how well risks are understood.