TS EN IEC 60300-3-4
Dependability management - Part 3-4: Application guide - Specification of dependability requirements
This part of IEC 60300 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.
Whilst mainly addressing system and equipment level dependability, many of the techniques
described in the various dependability related IEC standards can also be applied to products or
at the component level. The term “item” is used throughout this document.
This guidance is given in a basic project context where an acquirer obtains an item from a
supplier. It can be modified and adapted to other situations as needed.
NOTE 1 This document does not directly consider safety and environment specifications although much of the
guidance in this document could also be applied to them.
NOTE 2 This document does not cover items with special multi-stakeholder long-term arrangements (e.g. services
provided through Public-Private Partnership procurements) and how dependability is specified in such arrangements.
NOTE 3 The guidance in this document can be applied to some aspects of the specification of requirements relating
to software but specific guidance can be found in IEC 62628 [5] and the different parts of the IEC 61508 series [6].
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About This Item
TS EN IEC 60300-3-4 is an application guide for defining dependability requirements for an item and for bringing those requirements together in a specification. In practical terms, it helps organisations describe what level of reliability, maintainability, supportability and availability is needed, and how those expectations can be communicated between an acquirer and a supplier in a project setting.
How dependability requirements are structured
A key value of this document is that it supports the move from broad expectations to requirements that can be stated, reviewed and argued against in a disciplined way. Quantitative requirements may be expressed through metrics such as failure rate, mission time, repair time or availability. Qualitative requirements can cover operating context, maintenance concept, logistics support, documentation expectations and acceptance criteria. This distinction matters because dependability is not only about how often something fails, but also about how quickly it can be restored and how well it can be supported over its life cycle.
Where the guidance applies, and where it does not
The document mainly addresses dependability at system and equipment level, while recognising that many of the related techniques can also be adapted for products or components. It uses the generic term “item” throughout to keep that wider perspective. The guidance is set in a basic acquisition context, but it can be adapted to other arrangements as needed. It does not directly address safety and environmental specifications, and it does not cover special long-term multi-stakeholder arrangements such as Public-Private Partnership procurements. For software-related requirement specification, more specific guidance is available in IEC 62628 and parts of the IEC 61508 series.
- Guidance for specifying dependability requirements in a specification.
- Covers reliability, maintainability, supportability and availability.
- Helps acquirers check that requirements can realistically be met.
- Helps suppliers interpret and respond to dependability expectations.
- Primarily aimed at project-based acquisition of an item.
- Publication Date: 12.05.2022
- Standard Status: U (Yürürlükteki Standard/Standard)
- Publisher: TSE
- Document Language: en
- ICS Classification: 03.100.40 Araştırma ve Geliştirme ; 03.120.01 Kalite (Genel)
- Pages: 65
- Source Standard: EN IEC 60300-3-4:2022
- International Equivalents: EN IEC 60300-3-4-EQV; IEC 60300-3-4-EQV
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