Just-in-Time (JIT) Delivery

Just-in-Time (JIT) delivery is a supply and production strategy in which materials and components arrive exactly when they are needed for the next step, rather than being stocked in advance. The aim is to minimise inventory, tied-up capital and warehouse space by synchronising deliveries tightly with actual consumption. Originating in Japanese automotive manufacturing, JIT is now a standard concept across DACH industry and is closely linked to Kanban pull control and lean production. In an ERP context, JIT shapes how material planning, scheduling and supplier calls are configured.

The underlying idea

JIT treats inventory as a cost and a symptom of imperfect coordination rather than as a safeguard. By delivering the right quantity at the right moment, an organisation reduces storage, handling, obsolescence and the working capital frozen in stock. Achieving this requires reliable suppliers, short and predictable lead times, stable quality and accurate demand signals. JIT is one expression of lean thinking and frequently works hand in hand with Kanban, which provides the pull signal that triggers each replenishment. Where JIT supplies single parts, the related Just-in-Sequence approach delivers them in the exact order in which they will be consumed on the line.

How ERP supports JIT

An ERP or planning system enables JIT through delivery scheduling agreements, call-off orders and tight integration with material planning. Instead of placing discrete purchase orders, buyers agree framework contracts and the system issues forecast and firm call-offs against them. MRP and, for finer time grids, advanced planning and scheduling translate the production programme into precise material requirement dates. Electronic communication via EDI transmits these call-offs to suppliers in standardised messages, so that delivery instructions update automatically as the schedule changes.

Risks and trade-offs

• Supply chain fragility: with little buffer, a single disruption can halt production, as several recent crises have shown.
• Dependence on reliability: JIT presumes dependable suppliers, transport and quality; variability undermines it quickly.
• The bullwhip risk: tightly coupled signals can amplify demand swings upstream, an effect known as the bullwhip effect.
• Safety-stock tension: JIT reduces but rarely eliminates the need for a calculated safety stock at critical points.

JIT in practice today

Recent supply disruptions have prompted many DACH manufacturers to revisit pure JIT and adopt hybrid models, holding modest buffers for critical or long-lead items while keeping high-volume standard parts on a JIT regime. The strategy remains valuable where supply is stable and volumes are high, but it is increasingly applied selectively rather than dogmatically. The decisive factor is the maturity of the surrounding processes: JIT rewards disciplined planning, reliable partners and accurate data, and punishes organisations that adopt it without that foundation. For this reason JIT is best understood as the outcome of a well-controlled supply chain rather than a switch that produces low inventory on its own.

Related Topics

• Kanban
• EDI
• ERP for automotive