In business, outsourcing involves the contracting out of a business process (e.g. payroll processing, claims processing) and operational, and/or non-core functions (e.g. manufacturing, facility management, call center support) to another party (see also business process outsourcing). The concept "outsourcing" came from the American Glossary 'outside resourcing' and it dates back to at least 1981. Outsourcing sometimes involves transferring employees and assets from one firm to another, but not always. Outsourcing is also the practice of handing over control of public services to private enterprise.