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Since August 2012, the NIEM community has been hard at work supporting the development of the next major release of the model. And now, it’s here!

Thank you, NIEM community, for contributing to this 13-month effort!

Together, we: Thermometer graphic 3.0 Fireworks

  • Held 20+ model harmonization calls
  • Received 100+ review submissions
  • Conducted 3 rounds of public reviews
  • Received comments from federal, state, local, international, and industry partners

We couldn’t have done it without you!

P.S. The NIEM 3.0 schemas are now available (cue the fireworks)! But—some work remains. Soon to come are new versions of the:

  • NIEM Naming and Design Rules (NDR)
  • NIEM Model Package Description (MPD) Specification
  • Conformance Specification
  • Conformance Target Attribute Specification

Alpha versions of the NDR and MPD and beta versions of the Conformance and Conformance Target Attribute​ specifications are available for community viewing. If you have any recommendations or suggestions, please submit them here​. (Please select NIEM 3.0 Feedback under Category.) Keep in mind, these documents are works-in-progress and changes are expected over the coming weeks. As these documents mature, we will update the links with the latest version.

What’s changed from NIEM 2.1 to NIEM 3.0? Find out here.


We’ll continue to provide updates on key NIEM 3.0 milestones and progress on this page. The full NIEM 3.0 delivery timeline is provided below.

NIEM 3.0 Timeline            
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