Designed experiments can often be applied in the product
design process. To illustrate, suppose that a group of engineers
are designing a door hinge for an automobile. The quality characteristic
of interest is the check effort, or the holding ability of
the door latch that prevents the door from swinging closed
when the vehicle is parked on a hill. The check mechanism
consists of a spring and a roller. When the door is opened, the
roller travels through an arc causing the leaf spring to be compressed.
To close the door, the spring must be forced aside,
which creates the check effort. The engineering team believes
the check effort is a function of the following factors:
1. Roller travel distance
2. Spring height pivot to base
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