In the U.S., the FCC and the National Telecommunications and Information Administration regulate use of radio-frequency spectrum to help ensure there's enough available for 5G networks, satellites, and everything else. When there could be interference, FCC and NTIA coordinate with other federal agencies via interagency agreements and groups. The agreements and groups use some key collaboration practices but not others. For example, there are no clear processes for resolving matters when agencies can't agree on issues. We recommended that FCC and NTIA update and clarify various documents and processes to better coordinate on spectrum management.