Using epidemiological techniques, a group of psychiatrically disturbed individuals and a group of healthy, well-adjusted people were identified in a rural community. These 123 people were studied intensively for five years. Methods included psychiatric interviewing, collecting community informat and medical data, and psychological testing. A list of personality attributes which seem to equip people to deal with this particular environment was evolved.
Beiser M. A Study of Personality Assets in a Rural Community. Arch Gen Psychiatry. 1971;24(3):244-254. doi:10.1001/archpsyc.1971.01750090050007