Especially relevant are a variety of charge-transfer (CT) metrics. These can be used as prognosticators of (potentially catastrophic ) problems with conventional TD-DFT's description of long-range CT. The practical effect is that TD-DFT significantly underestimates excitation energies for states having significant CT character, including Rydberg states. Significant progress has been made recently towards correcting this behavior, via long-range corrected (LRC) density functionals, yet it remains important to possess a means to diagnose problematic cases.