On 6 March 2026, the International Organisation for Standardisation released ISO/PAS 25955, formally recognising the Data Documentation Initiative (DDI) within the ISO standards framework.

This milestone reflects many years of collaborative work by the DDI Alliance and the international DDI community to support consistent documentation and interoperability of research and statistical data.

The publication of ISO/PAS 25955 is a recognition of the strength of the DDI Alliance’s role as a globally trusted framework for documenting statistical and research data and supports its adoption by governments, statistical agencies, research infrastructures, and data repositories.

Why this matters for the DDI Community

Publication as an ISO standard is an important step in strengthening the role of DDI in the global research data ecosystem.

ISO recognition:

• Increases international visibility and trust in DDI as a robust suite of products for describing research data

• Supports adoption by governments, national statistical agencies, archives, and research infrastructures that rely on ISO-recognised standards

• Strengthens interoperability between DDI standards and other international standards used across the data lifecycle

• Helps ensure the long-term sustainability and governance of the DDI suite as part of the broader standards landscape
   

For organisations managing, curating, and sharing data – especially in the social, behavioral, economic, and health sciences – this recognition reinforces DDI products as key tools for enabling better data documentation, discovery, reuse, and interoperability.

A community achievement

This publication would not have been possible without the dedication of many contributors, says Jared Lyle, pictured below, executive director of the DDI Alliance:

“We are deeply grateful to the members of ISO Technical Committee 46 / Subcommittee 4 (TC 46/SC 4) for their collaboration and support in bringing this work to publication.

Under the DDI Alliance, a temporary Working Group was established under the Scientific Board to plan this work, led by Dan Gillman. We extend special thanks to Dan and Arofan Gregory for creating the initial design of the ”DDI Common Core” document. This served as the source for the ISO specification and defines the core elements of DDI – including the Variable Cascade, Unit Cascade, and Value Domains – within the Data Lifecycle.”

The Common Core document, written by Dan Gillman, was used as the initial draft of the proposed ISO standard. This draft was submitted to ISO TC46/SC4. Dan also shepherded the draft following the ISO process to final publication.

“We extend sincere thanks to the experts who devoted significant time to reviewing the specification and contributing thoughtful feedback throughout the ISO process. Their careful work helped ensure the quality and clarity of the final publication. Finally, we thank the many members of the DDI community – technical contributors, reviewers, implementers, and organisational supporters – whose work over many years laid the foundation for this achievement,” finished Jared Lyle. 

Looking ahead

The publication of ISO/PAS 25955 marks an important milestone, but it is also part of an ongoing journey for the DDI Alliance, as they will continue to work with partners across the international standards landscape to advance interoperability, support the evolving needs of data producers and stewards, and strengthen the infrastructure that enables high-quality, reusable research data.

Learn more

For more information about ISO/PAS 25955 and what this recognition means in practice, especially for existing DDI implementations and DDI Alliance members, please visit the DDI Alliance’s dedicated page: DDI Recognised as an ISO Standard (ISO/PAS 25955) web page.