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Outsourcing: using another business (a “third party”) to undertake a part of the production process rather than doing it within the business using the firm's own employees
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Subcontracting: practice of assigning to another business (the subcontractor) part of a contract for example, a specialist activity that makes up part of construction contract.
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Insourcing: reverse of outsourcing as it is undertaking a business function or process within the business rather than contracting it to another business.
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Inshoring: ending offshoring contracts with overseas suppliers and returning functions or processes to business operations in the home country.
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