In some cases (e.g. CB radio), the public may use spectrum without a license. Commercial users (such as television, AM/FM radio, and some types of two-way communications) will receive an FCC assignment to a portion of spectrum, which may be a single frequency or a band of frequencies. In issuing broadcast licenses the FCC relies on "comparative hearings", whereby the most qualified user will be granted use of the spectrum to best serve the public interest; researchers have pointed out that this procedure favors incumbents.