Bathtub-shaped hazard function

Bathtub-shaped hazard function is a reliability model that shows that products are more likely to fail either very early in their useful life or very late in their useful life.

Definition

According to Managing Quality by Foster (6th edition),

Bathtub-shaped hazard function. Reliability model that shows that products are more likely to fail either very early in their useful life or very late in their useful life.