Accreditation is often a voluntary process in which organizations choose to participate, rather than one required by law and regulation.

认证通常是自愿的，机构可自行选择参加与否，而非由法律或规章强制进行。

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Mediation is a voluntary process and the mediated agreement one upon which all parties agree without coercion of any kind.

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If it is a voluntary process it can't work.

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Brooks said the project was still in the early phase of field testing, and participating in the AVATAR interview process was entirely voluntary at this stage.

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