If resources and patient mix remain the same, a service will be able to treat in the future the same volume of patients it has in the past. Thus, based on this historic treatment pattern, a service can predict to a reasonable degree of accuracy, the volume of patients to who a commitment to treatment within six months can be given. Commitment should be given to patients with the highest priority. Patient priority is determined by their level of clinical need and is identified by way of a numerical score. Each service is aware of the lowest priority score at which it has historically been able to treat the majority of its patients. However for a variety of reasons, a service will appropriately decide to treat a few additional patients who have relatively low priority scores. In recognition of the existence of this latter group, the actual treatment threshold (aTT) is calculated as the 10th centile priority score assigned to all patients treated in the past 12 months. A service should therefore be able to treat all patients above the aTT. This indicator measures the number of patients above the aTT who have not been given a commitment to treatment. The goal is to have no patients above the aTT without a commitment to treatment.