Commissioner is a professional appointed to carry out statutory decision-making duties on behalf of the appointing organisation, and/or to serve as an independent adviser to the governing body in the making of those statutory decisions.
Contracting is putting the purchasing of services in a legally binding agreement.
Decommissioning is the process of planning and managing a reduction in service activity or terminating a contract in line with commissioning objectives.
Procurement is the process of acquiring goods, works and services, covering both acquisitions from third parties and from in-house providers. The procurement process spans the whole cycle from identification of needs through to the end of a services contract or the end of the useful life of an asset.
Purchasing is the process of securing or buying services.