Planned Preventative Maintenance (PPM) is an essential service that should be used in the correct management of all commercial and industrial properties. PPM ensures maximum operating efficiencies, prolongs the life expectancy of any infrastructure, can highlight potential future maintenance needs preventing costly and disruptive emergency measures. By managing properties in this manner, AES-Marconi can provide its clients with a single point of contact for the planning and co-ordinating of tailor-made maintenance schedules, therefore minimise the effects of such maintenance on commercial or industrial activities.