ECSS-Q-ST-30C – Dependability (6 March 2009)

This Standard is cancelled and replaced by ECSS-Q-ST-30C Rev.1 (15 February 2017)


This Standard defines the dependability assurance programme and the dependability requirements for space systems.

Dependability assurance is a continuous and iterative process throughout the project life cycle.

The ECSS dependability policy for space projects is applied by implementing a dependability assurance programme, which comprises:

  • identification of all technical risks with respect to functional needs which can lead to non-compliance with dependability requirements,
  • application of analysis and design methods to ensure that dependability targets are met,
  • optimization of the overall cost and schedule by making sure that:
    • design rules, dependability analyses and risk reducing actions are tailored with respect to an appropriate severity categorisation,
    • risks reducing actions are implemented continuously since the early phase of a project and especially during the design phase.
  • inputs to serial production activities.

The dependability requirements for functions implemented in software, and the interaction between hardware and software, are identified in this Standard.

NOTE 1 The requirements for the product assurance of software are defined in ECSS-Q-ST-80.

NOTE 2 The dependability assurance programme supports the project risk management process as described in ECSS-M-ST-80.

This Standard applies to all European space projects. The provisions of this document apply to all project phases.

This standard may be tailored for the specific characteristic and constrains of a space project in conformance with ECSS-S-ST-00.


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This Standard cancels and replaces ECSS-Q-30B (8 March 2002), and ECSS-Q-30-01A (31 March 2005).

This standard is supported by the following ECSS Handbooks: