Wider System: The ESDS itself may be a subsystem of another system which can be regarded as a wider system. The destina- tion of wider system of the ESDS depends on the issue that the ESDS is concerned. For instance, if the main concern of estab- lishing the ESDS is to improve the effective- ness of the overall computerisation of the organisation, the wider system of the ESDS would be the business information system of the organisation.