For disease outbreak detection, the public-health community has historically relied on the watchful eyes of physicians and other health-care workers.

Earlier animal trainers had historically relied primarily on punishment when teaching animals.

Proficiency schemes have historically relied upon patient biopsies with known mutation status for distribution to member laboratories.

Unlike radio in most other countries, American radio has historically relied on commercial sponsorship rather than public funding.

The town has historically relied largely on sheep, cattle and wheat farming.

Given their geographic location, they have historically relied on Turkey for international leverage.

The game historically relied on local ticket sales, and the participating schools struggled to sell their alloted tickets.

In the west, infant potty training historically relied on timing as the main method of training.

And Democrats have historically relied on a gender gap advantage - with women.

As in many other countries, water resources management in Brazil has historically relied upon heavy investment on hydraulic infrastructure.