IEC 60300-3-4:20 22给出了关于指定可靠性要求和在规范中整理这些要求的指导，以及确保实现可靠性要求的方法列表。 提供的指导包括: ？规定定量和定性的可靠性、可维护性、可支持性和可用性要求； ？就如何确保供应商能够满足要求向收购方提供建议； ？建议供应商帮助他们满足收购方的要求。 除了根据本文件得出的任何要求之外，其他义务（如法律和政府法规）也可以对项目提出要求。

IEC 60300-3-4:2022 gives guidance on specifying dependability requirements and collating these requirements in a specification, together with a list of the means of assuring the achievement of the dependability requirements.
The guidance provided includes:
？ specifying quantitative and qualitative reliability, maintainability, supportability and availability requirements;
？ advising acquirers on how to ensure that the requirements can be fulfilled by suppliers;
？ advising suppliers to help them meet the acquirer's requirements.
Other obligations, such as legislation and governmental regulations, can also place requirements on items, in addition to any requirements derived in accordance with this document.