Customers almost always anticipate or require that new software and systems deliver cost benefits. In some cases software replaces an existing automated system, but the new software has cheaper hardware and lower maintenance overheads. For instance, where a single, centralised computer system is replaced by a network of smaller PCs. Or the software system replaces a manual system and so savings may be made on paper, paper storage space like filing cabinets, and office space. There may be an improvement in communications resulting in fewer telephone calls and faxes. In both cases there may well be a saving on the number of staff required to support the old system.