The temporary or contingent workforce is the fastest growing segment of the national workforce. Contingent workers are those who are hired through staffing firms or leasing companies and whose jobs are structured to last only a certain length of time. The contingent workforce may include part-time temporary workers, independent contractors, consultants, contract employees, leased employees, and direct hires. Other than some leased long-term employees, most contingent workers are considered "temporary" and therefore the terms "contingent" and "temporary" are often used synonymously. While most companies hire only a few contingent workers at a time, some firms may lease their entire workforce on a quasi-permanent basis

Using contingent workers may provide employers with flexibility and cost-savings. However, there are numerous legal and practical considerations that employers must take into account before utilizing contingent workers.