Yield
Yield measures the percentage of good units produced relative to total units started or materials consumed in a manufacturing process. Higher yields mean less waste and more efficient conversion of inputs to salable outputs. Yield directly affects product cost and manufacturing productivity.
Examples
First pass yield: A semiconductor fabrication process starts 100 wafers and produces 85 good wafers, for 85% first pass yield. The 15 rejected wafers represent lost material and processing cost.
Throughput yield: An assembly line with multiple inspection points measures yield at each stage. If 95% pass each of 4 inspections, overall throughput yield is 0.95^4 = 81%. Each process step's yield compounds into final yield.
Rolled throughput yield: A process produces 1,000 units; 920 are acceptable without rework, and 80 require rework (of which 60 become acceptable). First pass yield is 92%, but accounting for rework effort provides different economics insight.
Definition
Yield loss represents wasted materials, labor, and overhead. Every unit that doesn't pass inspection consumed resources without generating revenue. Improving yield directly improves profitability.
Yield affects procurement in multiple ways. Supplier quotes should account for their process yield in pricing. Lower yield suppliers may have higher prices or less competitive margins. Understanding supplier yield helps evaluate cost breakdowns and identify improvement opportunities.
Yield also affects material requirements. If process yield is 90%, producing 1,000 good units requires starting approximately 1,111 units. Material planning must account for yield loss to ensure sufficient supply.
Yield improvement is a continuous focus in manufacturing. Process optimization, defect analysis, equipment maintenance, and operator training all contribute to yield improvement. Even small yield gains multiply across high volumes into significant value.
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