Citing concerns raised by commenters, the FCC terminated two closely watched rulemaking proceedings that had been launched at the recommendation of the agency’s spectrum policy task force. The first of these proceedings, initiated in November 2003, considered the establishment of an “interference temperature” methodology in certain spectrum bands that would enable market entrants to operate at higher power levels within unlicensed underlays of licensed frequencies. Although, at the time, FCC Commissioner Michael Copps asserted that the interference temperature method of managing interference “holds promise in improving the Commission’s ability to carry out its statutory duty to encourage more efficient uses of the radio spectrum,” a host of licensees protested that the authorization of underlays within their frequency allotments would raise the “noise floor” and would thus cause harmful interference to their operations. Terminating the proceeding, the FCC found merit with commenters’ claims that the interference temperature methodology “is not a workable concept and would . . . increase interference in the frequency bands where it would not be used.” Ending a second proceeding on the adoption of receiver standards, the FCC declared that, “with the passage of time, the notice and record in this proceeding have become outdated.” The agency also ruled, “to the extent receiver interference immunity performance specifications are desirable, they may be addressed in proceedings that are frequency band or service specific.”