To assist lift and escalator owners or their property management agents to choose appropriate RCs for provision of lift/escalator maintenance and repair services, EMSD introduced the Contractors' Performance Rating System (“CPR”) in June 2009. The CPR is based on a scheme of performance monitoring (“PM”) points to provide a fair and transparent mechanism for reflecting the performance of registered contractors ("RCs") in safety and service quality aspects. The CPR is not a requirement under the Ordinance. It is an administrative measure adopted by the EMSD to support enforcement of the Ordinance. The EMSD reviews and improves the CPR from time to time. The current system is the latest version incorporated with changes made in consultation with the Lift and Escalator Safety Advisory Committee.