These DDI training materials are approved products of the DDI Alliance. The Data Documentation Initiative (DDI) is an international metadata standard for describing the data produced by surveys and other observational methods in the social, behavioral, economic, and health sciences.

These official training materials are created by volunteers and undergo a quality review process by the DDI Training Working Group and the DDI Scientific Board. They are designed for self-guided learning about DDI and can also be reused to teach others about DDI and related topics.