求翻译：This guide has been prepared to assist in the adoption of a common and systematic approach to the planning and undertaking of commissioning exercises. The extremely varied nature of projects means that there are many different situations under which commissioning will be undertaken. This guide does not attempt to cover all such scenarios but aims to identify all the issues which require consideration. It is then up to the person responsible for commissioning to select and tailor the information to their specific task. The guide brings together experiences from a number of previous projects and is likely to provide most benefit to those with little or no prior commissioning experience.是什么意思？

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