The ongoing management of an entire facility, function, or department at a customer site, usually including responsibility for hiring, training, and management of staff, as well as the provision of equipment and supplies necessary to perform the contracted function by an outside vendor. Assigned staff are usually permanent employees of the service provider, though temporaries may also be used in a routine or supplemental way. Responsibility for the product or service rests completely with the supplier, so these are (ostensibly) not temporary- or leased-employee arrangements. (See also: Employee Leasing, Sole Employer.)
Source: Staffing Industry Analysts