formula_20–PSC is defined like formula_7–PSC, but is based on the Hagenbach-Bischoff quota formula_23 instead of the Hare quota, and the number of voters in formula_1 must exceed formula_8 Hagenbach-Bischoff quotas. It is a more general form of the majority criterion because it allows for groups of supported candidates (solid coalitions) instead of just one candidate, and there may be more than one candidate that will be elected. Because some authors call the fraction formula_23 a Droop quota, formula_20–PSC is also known as the Droop proportionality criterion.