1. A method for measuring healthcare quality, the method comprising the steps of: a plurality of computers operating in parallel receiving a patient dataset representative of patients within a healthcare organization, the patient dataset being distributed across the plurality of computers as subsets of patient datasets; the plurality of computers receiving at least one healthcare quality measure definition comprising a numerator and a denominator; the plurality of computers identifying, in the subsets of patient datasets, patient data that corresponds to the measure definition; the plurality of computers attributing the identified patient data to at least one provider based on an attribution rule; the plurality of computers calculating at least one healthcare quality measure for the at least one provider, according to the healthcare quality measure definition, based on the attributed patient data; and the plurality of computers storing the at least one calculated healthcare quality measure in a measure dataset.