Information system audit, briefly write out the purpose and performance of the system that should be focused on.

Enterprise informatization performance evaluation is a systematic project, involving a wide range and complicated content. Both the organization and implementation of evaluation work and the concrete application of evaluation results must follow certain system norms. With the development of enterprise informatization, it is necessary to solve the deeper system and mechanism problems, and establish and implement the relevant work system of enterprise informatization performance evaluation from the macro level. 1 The government guides through policies and regulations. Due to the limitations of enterprises, the understanding of performance management needs to go through a process from passive acceptance to active understanding. The performance management system should be gradually established and improved by enterprises themselves, which will be a long process. The government's policy implementation and legislative guidance is a shortcut to improve the enterprise performance management system, which is helpful to create an atmosphere of attaching importance to performance management from a macro perspective and gradually guide enterprises from compulsory implementation to independent performance management. The government plays a very important guiding role in the implementation of American IT performance management system. Since 1990s, the United States has promulgated various laws to guide organizations to attach importance to IT performance through government actions. The following are some measures taken by the U.S. government: The Chief Financial Officer Act (CFO Act) promulgated by 1990 requires that institutions should pay attention to the performance information in financial statements, including systematic evaluation information, formulate annual performance plans, and use measurable and comparable performance indicators to measure the relevant output and service level. The Government Performance and Achievement Act and the Federal Procurement Simplification Act (FASA) were promulgated in 1993 and 1994, respectively. The Act requires federal agencies to examine several aspects such as cost, performance and planning during evaluation. To determine whether there are delays, cost overruns and inconsistencies with production capacity, this bill actually unifies planning with responsibility and performance. 1995, the paper reduction bill was promulgated. The bill requires institutions to establish information resource management objectives, improve productivity and efficiency through information technology, and advocates improving the work efficiency of government departments by redesigning workflow and applying information technology. Organizations need to analyze the cost-benefit of it and conduct review, acceptance and document management after implementing the information system. 1996, klinger-Cohen Act promulgated; The bill requires a plan to use it to improve goals. The performance evaluation goal must evaluate how IT supports the organization's plan, and the organization must set a benchmark to provide a comparable benchmark in terms of cost, speed, productivity, output, quality and results, so as to ensure that IT investment effectively supports the management process of the organization's mission. In addition, the annual performance evaluation should explain the specific operation of IT in the organization. These successive legislations require the improvement of IT performance management, and emphasize implementation responsibility and result-oriented management. These bills define cost-effectiveness and schedule targets, and suggest simplifying the plans of federal organizations through IT. The promulgation of these bills has promoted the development of results-oriented performance management. The promulgation of these bills has played a positive role in promoting IT performance management. The top leaders of the organization must pay more attention to IT performance. However, for the managers of an organization, the ultimate goal is not only to establish a form that meets the requirements of these laws and regulations, but how to use effective IT management methods and systems to manage and measure performance. Therefore, performance management has gradually shifted from government compulsion to independent evaluation required by enterprises. The performance management practice of American government also has a strong reference significance for China. At present, our government controls the development, operation and maintenance of information systems through laws and regulations to ensure the safety and quality of information systems. In particular, information systems that require high security and real-time response, such as government affairs, banking, insurance and national defense security, and are related to the international people's livelihood, are strictly controlled through laws and systems. For some listed companies, in order to protect the interests of investors, the external control of laws and regulations also plays a great role and must be carried out in accordance with certain rules and regulations. This shows that our government has played an important role in ensuring the quality of informatization. As the government pays more and more attention to the informatization performance, it will also adopt legal and institutional means to standardize the informatization performance management of enterprises and introduce corresponding institutional norms. For example, a series of unified system norms can be defined, such as "enterprise informatization performance evaluation method", "enterprise informatization performance evaluation method selection and working procedure", "enterprise informatization performance evaluation index setting and standard selection" and "enterprise informatization performance evaluation result application", which has far-reaching significance for promoting the development of informatization construction in a rational and orderly direction. 2 Introduction of IT audit system In order to realize the healthy development of information construction, although laws and regulations have played a very important role, they are far from enough. It is necessary to standardize and implement the dynamic mechanism of organizational internal control and government and market supervision system through industry monitoring within the industry. At present, China has gradually introduced the internationally popular IT audit system to strengthen the control of the whole information construction. It audit is an independent verification activity, which mainly audits the effectiveness, efficiency and security of IT by an independent qualified third party. IT audit system can effectively control the risk of information resources investment, thus ensuring the value-added of information resources and effectively regulating the industry order. In view of the huge growth space of it service industry in China in the future, internationally renowned consulting companies and professional technical service providers have rushed to the China market to provide information system audit services in line with international standards, which has also played a certain role in promoting the development of IT audit in China. Developing third-party consulting service is also an effective measure to promote the establishment of performance evaluation system. In view of the complexity of enterprise IT application project, people who have not experienced the actual project can't grasp the promotion of the whole project and can't effectively avoid risks. Therefore, enterprises need the help of third-party consulting services, that is, professional IT management consulting companies. Through the information management diagnosis and business process optimization consulting services provided by an independent third party, this paper describes the clear vision of its information system construction process, establishes an information master plan based on core competitive strategy and IT strategy, and establishes a business process function model based on IT strategic planning. Third-party management consulting companies can provide enterprise users with IT strategy consultation, information management diagnosis, business process optimization, information project feasibility study, overall planning and information system design. In the process of informatization implementation, the third party can define the evaluation criteria during and after informatization project implementation, establish a platform for communication and coordination between Party A and Party B, and establish a complete enterprise informatization performance evaluation system to avoid the delay in enterprise information system construction caused by unclear demand and inconsistent evaluation criteria, reduce the risk of informatization failure from the source, and finally improve enterprise informatization performance.