People have always needed to find others for employment, but the field of recruitment and selection is a relatively modern development. The development of standardized tests such as IQ led gradually to the modern field of human resources (HR) recruitment.
The U.S. Army in World War I practiced some early methods of selection, using the IQ test to place recruits in specific positions. This use of a standardized test to rank individuals became adopted by many companies.
Legislation passed during the middle of the 20th century restricted certain hiring practices. Equal opportunity legislation and the expansion of protected classes slowly made previous questions illegal. According to the the Department of Labor, current interview practices must be structured to respect these protected classes.
Modern day selection techniques revolve around finding the applicant most suitable for the position. According to "Recruitment and Selection", 94 percent of companies use behavioral interviews to rank their applicants. These questions select applicants with the best skills for the position.