DDMRP: Implementing It for Multi-Level Supply Chain Management

DDMRP is a model that manages the Supply Chain through stock buffers positioned at strategic points, improving flow and visibility. It reduces inventory and variability compared to traditional MRP by basing production and procurement on actual orders rather than forecasts.

The basic principles of DDMRP involve production and procurement driven by actual orders, not forecasts. It utilizes decoupling buffers and adaptive updates to make the system more responsive, reduce variability, and simplify management while integrating long-term planning.

Decoupling buffers in DDMRP are adaptive, as they update based on demand. They act as a barrier to the propagation of requirements. They allow for procurement based on actual orders and reduce variability, avoiding the bullwhip effect typical of traditional MRP.

The 5 steps of DDMRP include: strategic buffer positioning, buffer profiles and sizing, dynamic adjustment, demand-driven planning (order release), and highly visible and collaborative execution. This approach reduces variability and improves Supply Chain responsiveness and efficiency.

DDS&OP integrates medium-to-long-term planning with DDMRP, updating buffers based on demand forecasts. Variations in ADU (Average Daily Usage) influence Supply Chain capacity, dynamically adapting the system and periodically recalibrating configurations and resources.

The Makeitalia simulator allows for predicting the effects of DDMRP on service levels and stock. In the presence of variable demand, dynamic buffers ensure stability, avoiding stockouts and optimizing inventory levels. Tests show a reduction in average stock and better distribution compared to traditional management.

DDMRP offers greater benefits in contexts with standard or modular products, variable demand, and flexible production capacity. In other cases, it remains applicable, but the advantages should be evaluated. Industry studies nonetheless show positive results across various industrial sectors.