2.1 In terms of quantitative measures, PFI and privately- managed prisons are monitored against a range of contractual performance measures whereas public prisons are assessed on performance against a range of KPTs. Although there are features common to the two systems there is currently a lack of consistent data, both in terms of quality and in what it measures. It is not therefore possible to make a meaningful comparison of PFI and public prisons by simply comparing performance against KPTs even where those figures are available. This will become easier if the Commissioner for Correctional Services renegotiates the performance measurement systems in PFI contracts.