The primary rationale behind an episiotomy is related to the nature rather than the size of the tear.

Predation of livestock became the primary rationale behind wolf elimination.

The primary rationale for purchasing life insurance must be to protect one's family from the economic consequences of the breadwinner's death.

But many supporters of change argue that the primary rationale for a new system is economic.

We are left, then, with retribution as the primary rationale for imposing the death penalty.

Thus the primary rationale for code sharing is to expand one's service offerings in city-pair terms to increase sales.

The primary rationale for updating the 182 was Cessna's return to manufacturing of that model in the late 1990s.

Military officials and detainees' lawyers said the primary rationale for the hunger strikes had evolved since last summer.

The Air Force's primary rationale at that time was the poor condition of Loring's facilities.

"The primary rationale for public funding is the quality of the public service that's being provided," she said.