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CASRAI
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Five Safes framework

A framework for the safe use of sensitive data in research, articulated by the UK Office for National Statistics, that organises controls under five dimensions: Safe People, Safe Projects, Safe Settings, Safe Data, and Safe Outputs.

ByCASRAI Editorial Board
· Last updated 21 May 2026

Examples

Worked examples

  • Is an instance

    An ONS Secure Research Service project requiring Safe-People accreditation, a Safe-Projects approval, work in Safe-Settings, on Safe-Data, with Safe-Outputs disclosure control.

  • Is an instance

    A NHS England SDE applying the Five Safes to a research-use access decision.

Counter-examples

Looks similar, but isn't

  • Not an instance

    Encryption-at-rest alone is not the Five Safes u2014 encryption is one technical control within Safe Settings.

  • Not an instance

    A signed NDA without the other four 'safes' is not the Five Safes framework.

Editorial commentary

Each 'safe' addresses a distinct control: Safe People (are the researchers vetted and trained?), Safe Projects (is the proposed use lawful, ethical, and in the public interest?), Safe Settings (is the analysis taking place in a secure environment?), Safe Data (has the data been appropriately minimised and de-identified?), Safe Outputs (have results been disclosure-controlled before release?). The framework underpins the operation of UK government statistical microdata access (ONS SRS), TREs across the NHS England SDE network, and many international equivalents.

References

  • Desai T., Ritchie F., Welpton R., 'Five Safes: designing data access for research' (Bristol Centre for Economics and Finance working paper, 2016).

Also known as

Five Safes · 5 Safes

Machine-readable encodings

Use in your systems

JATS XML <role> element
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Schema.org DefinedTerm (JSON-LD)
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