Contracting, sub-contracting, or 'externalizing' non-core activities to free up cash, personnel, time, and facilities for activities where the firm holds competitive advantage. Firms having strengths in other areas may contract-out data processing, legal, manufacturing, marketing, payroll accounting, or other aspects of their businesses to concentrate on what they do best and thus reduce average unit cost. Outsourcing is often an integral part of downsizing or reengineering. Also called contracting out.