Mastering Engineering Complexity Under Cost and Time Pressure.

In engineer-to-order projects, the technical solution sometimes develops in parallel with order processing. Customer requirements are specified, interfaces clarified, and individual assemblies designed while other project parts are already being procured or manufactured.

The later a change occurs, the greater its economic leverage. What initially looks like a local adjustment in design can affect already ordered components, manufacturing orders, software, documentation, or assembly.

Long-lead items often need to be ordered before the complete design is finalized. At the same time, purchasing requires reliable specifications to contractually secure costs and delivery dates.

This overlap shortens lead times but increases the risk of changes. If a technical decision is later revised, new engineering efforts arise, and already placed orders or delivery dates must be adjusted.

ECR and ECO processes extend beyond bills of materials and drawings. A change can simultaneously affect costs, procurement, manufacturing, assembly, software versions, and the agreed scope of delivery.

Changes whose impacts are evaluated in different systems and areas of responsibility are particularly critical. The technical change status may already be approved, while schedule or cost implications only become visible later in the project.

Parallel customer projects access the same designers, software developers, manufacturing areas, test benches, and assembly teams. Capacity requirements are distributed very unevenly depending on the project phase and order type.

A large order or a schedule shift can thus affect several ongoing projects. Bottlenecks often arise in individual engineering disciplines, manufacturing resources, or during FAT, assembly, and commissioning.

A project can be far advanced in terms of schedule yet still lose economic quality. Additional engineering hours, rework, price increases in procurement, or customer changes not fully passed on alter the margin during the project lifecycle.

For long-running plant projects, comparing budget and actual costs is therefore insufficient. The remaining performance is also relevant: What costs will still be incurred until completion, what risks are already known, and what portion can be contractually passed on?