Trade-off curves are a powerful tool for understanding the performance limits of a design. They visualize the relationship between two or more key parameters that directly affect customer needs and the choices made during the design process. A classic example is the relationship between the diameter and wall thickness of a pipe (design decisions) and the fluid pressure and velocity expected by the customer (customer needs).
A complete trade-off curve consists of the following elements:
Based on this comprehensive analysis, the design team creates an engineering check sheet. This is a compact and efficient summary of key findings, which is then used in design reviews. The goal is to find a balance between functionality and efficiency, without losing sight of quality or customer satisfaction.