From September to November 2018, the National Institute of Standards and Technology (NIST) partnered with the National Association of Regulatory Utility Commissioners (NARUC) to hold a series of roundtable meetings to support the revision of its Framework and Roadmap for Smart Grid Interoperability Standards (hereafter the Framework). The Framework addresses the increasingly important ability to exchange actionable information between devices and organizations.Four one-day regional meetings were held to support development of Framework version 4.0, which reflects structural changes and increasing system complexity in the grid. Fast-paced grid evolution necessitates updated interoperability considerations, particularly as applied to the Framework's Smart Grid Conceptual Models. These diagrams have been expanded to include four communication pathways scenarios, Legacy Utility, High-DER Architecture, Microgrid, and Advanced Bulk to be considered moving forward (shown in Appendix F). The roundtables gathered input from stakeholders (utilities, service providers, regulators, technology suppliers) on the updated Framework, as well as input on regional issues that need consideration. Meetings were organized by regions and conceptual models, as follows:• The Midwest Regional Roundtable held in Indianapolis, Indiana, focused on Legacy Utility Communications. In this scenario, a logical model of legacy systems is mapped onto conceptual domains for smart grid information networks.

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