Open Contracting Data Standard: Documentation

Governments around the world spend an estimated US$9.5 trillion through contracts every year. Yet, contracting information is often unavailable for public scrutiny.

The Open Contracting Data Standard (OCDS) enables disclosure of data and documents at all stages of the contracting process by defining a common data model. It was created to support organizations to increase contracting transparency, and allow deeper analysis of contracting data by a wide range of users.

In this documentation, you will find:

  • Getting Started: Introducing the key concepts and features of the OCDS

  • Reference: Describing the specific rules that need to be followed to publish OCDS data

  • Guidance: Step-by-step instructions on how to design and implement an OCDS publication, including helpful tools and examples

  • Getting Help: Outlining how you can get Helpdesk support and how you can participate in the OCDS community

  • History: Information about the changes in each version of the OCDS

  • Data Review Tool: A tool to help check whether your data is following the OCDS correctly.

If you are interested to learn more about Open Contracting advocacy and how it can be used to support wider reform and measurable improvements in public contracting, please visit


This is the 1.1 release of OCDS, published on 31st May 2017. Version 1.0 documentation is still available from the version switcher at the bottom left of the page.

This is the English (and canonical) version of the OCDS documentation. You can switch language at the bottom left of the page.


The Open Contracting Data Standard is a core product of the Open Contracting Partnership (OCP).

Version 1.0 of the standard was developed for the OCP by the World Wide Web Foundation, through a project supported by the Omidyar Network and the World Bank.


A free helpdesk service is available to support implementation and use of OCDS.