What are the main factors to measure the importance of an information system?

The best answer is that IT operation and maintenance is the core and key part of IT management, and it is also the most complicated and tedious part. This stage is mainly used for the daily operation management within the IT department, and the objects involved are divided into two parts, namely the IT business system and the operation and maintenance personnel. The management content at this stage can be subdivided into seven subsystems: ■ Device management: monitoring the running status of network devices, servers and operating systems; Application/service management: Monitor and manage all kinds of application support software, such as database, middleware, groupware and various general or special services. Such as monitoring and management of mail system, DNS, Web, etc. ■ Data/storage/disaster recovery management: unified storage, backup and recovery of system and business data ■ Business management: including monitoring and management of the operation of the enterprise's own core business system. For business management, Mainly focus on CSF (CriticalSuccessFactors) and KPI (key performance indicators) of business systems ■ Directory/content management: this part mainly focuses on content management and public information management that enterprises need to publish uniformly or customize for people ■ Resource asset management: managing the resource assets of IT systems in enterprises, which can exist physically or logically and can interact with the financial departments of enterprises ■ Information security management: this part includes many aspects. At present, the international standard of information security management is ISO 17799, which covers ten control aspects of information security management, and 36 control objectives and methods in 127. Such as enterprise security organization, asset classification and control, personnel safety, physical and environmental safety, communication and operation safety, access control, business continuity management, etc. ■ Daily work management: this part is mainly used to standardize and clarify the job responsibilities and work arrangements of operation and maintenance personnel, provide quantitative basis for performance appraisal, and provide means for solving the accumulation of experience and knowledge. Every subsystem of IT operation and maintenance management contains very rich contents, and the realization of perfect IT operation and maintenance management is to improve the operation level and enjoyment of enterprises. The dividing line between the operation/maintenance phase and the service/support phase is that the former is aimed at the management within the IT department, while the latter is aimed at the business department, other personnel within the enterprise or directly at customers.