ECSS-E-10 Part 6A – System engineering – Part 6: Functional and technical specifications (9 January 2004)

This Standard has been cancelled and replaced by ECSS-E-10 Part 6A Rev.1 (31 October 2005).


This Standard provides an overview of the respective purposes and positions of functional and technical specifications, their required contents, and the process for developing these documents.

This Standard is applicable to all types of space systems, all product elements, and projects.

When viewed in a specific project context, the requirements defined in this Standard should be tailored to match the genuine requirements of a particular profile and circumstances of a project.

NOTE Tailoring is a process by which individual requirements of specifications, standards and related documents are evaluated and made applicable to a specific project, by selection and in some exceptional cases, modification of existing or addition of new requirements. [ECSS-M-00-02A, clause 3]