Number 122 – Determine How Customers and Suppliers in a Value Stream Affect One Another

Organizations often evaluate inventory, lead time, cost, and quality as separate measures of performance. Reports are generated, targets are established, and improvement efforts are launched when results fall short of expectations. While these measures are important, they are often the visible outcomes of decisions made much earlier within the value stream.

Every value stream is built upon relationships. Suppliers influence customers. Customers influence suppliers. Information, materials, expectations, and decisions move across connection points that link activities together. These connections frequently have a greater impact on performance than the individual activities themselves.

Inventory often accumulates where flow is interrupted. Lead time grows where information is delayed or misunderstood. Cost increases when processes are designed without regard for downstream consequences. Quality suffers when requirements are poorly communicated or assumptions replace understanding. In many cases, the problem does not originate within a process. It originates at the point where one process connects to another.

This is why understanding the relationships within a value stream is so important. Improvement efforts that focus only on local activities may improve individual performance while creating unintended consequences elsewhere. A supplier may reduce cost by increasing batch sizes, while a customer experiences longer lead times and higher inventory levels. One area appears to improve while the overall system becomes less effective.

The challenge is not simply to understand these relationships after they produce results. The challenge is to understand them early enough to influence design decisions.

Those involved in Production Preparation Process (3P), product development, process design, and system design recognize that many future outcomes are determined long before production begins. Decisions regarding flow, handoffs, information exchange, layout, scheduling, and customer-supplier interactions establish conditions that will eventually influence safety, quality, delivery, and productivity. The farther downstream a problem is discovered, the more difficult and costly it often becomes to address.

There was a saying often heard within machine design environments: shift the worry curve to the left. The intent was simple. Invest effort earlier in understanding relationships, risks, and consequences so fewer surprises emerge later. Thoughtful design does not eliminate problems, but it significantly improves the likelihood of achieving desired outcomes.

Operational Excellence requires more than improving individual processes. It requires understanding how processes affect one another and designing those relationships to support the performance of the entire value stream.

The most effective value streams are not the result of isolated optimization. They are the result of intentional connections.