In the general supervision process of information system engineering, two management ideas are usually adopted: milestone control and process control. When most of the elements involved in the process are clear and controllable, the milestone supervision method is more effective [1]. In the design of information system software engineering, what we can do is to invite experts to review it, which is very helpful, but some design errors can only be found in coding and testing. In information system engineering, due to the uncertainty and risk of the process itself, milestone supervision has great defects [2]:( 1) originally designed to help generate the final code, it often evolved into milestone design; (2) The design of milestones can't completely capture all the problems and hide some risks; (3) It is difficult to evaluate workload and work value; (4) The time when the milestone reveals the problem lags far behind the time when the problem appears. Compared with milestone supervision, it is a dynamic evaluation process based on process [3]. Milestones are not unimportant, but the regulatory thinking should be changed, so that the practice of milestones can be done better. The biggest problem with the milestone method is that we can't solve the problem until all the problems have been accumulated, and at this time, we often miss the best opportunity to solve the problem. The significance of dynamic evaluation based on process is that problems are constantly found and solved in the whole process, rather than being solved in batches after problems have accumulated to a certain extent. With the change of environment, the process is constantly adjusted to meet the needs of variability and uncertainty, which provides an opportunity for milestone practice to evaluate information system engineering at a higher level. 1 theoretical basis 1. 1 the core of supervision of dynamic control information system based on process is to reasonably control the investment, progress and quality of information engineering projects [4], which is the so-called three-objective control. Therefore, the supervision work needs to carry out target control under the guidance of dynamic control principle, measure the contractor's performance according to the planned standard, and correct the deviation in the actual process in time to ensure the expected planned goal. The target control framework of information system engineering supervision is shown in figure 1. The supervision of information system should be the whole process and all-round supervision, not just the key node or milestone of project implementation. Moreover, it is important that the supervision work should be able to prevent, understand and solve problems before they cause disaster consequences, understand the result management and manage according to the process. First, the regulatory environment should be improved by standardizing the flow environment of management and technical information flow; Second, integrate the contractor's project management process and improve the management process of cooperation between the two parties [5]. The latter problem is the main one, because the improvement of management process is caused by: (1) process is the driving force to meet customer requirements; (2) products of process generation mechanism; (3) Process is the key factor to maintain competitiveness; (4) The process is determined by factors such as the key to achieving the goal. The process-based method is to realize the dynamic cycle of continuous improvement, so that all parties concerned can benefit [5]. Therefore, the idea of information system engineering supervision should be to establish a visual information system engineering process, so that the supervision can take effective corrective measures to control when the performance of information system engineering deviates from the plan, and as a means to ensure the quality, investment, progress and change control of the project, so that information security and intellectual property management can meet the contract requirements. 1.2 improvement direction of information system software supervision combined with the characteristics of information system engineering and its supervision, the improvement of supervision process in information system engineering construction should focus on: (1) collaborative design based on visual process model, and supporting environment is the basis of target control, coordination and information management. On this basis, the owner, contractor and supervisor can cooperate tacitly to realize the ultimate value of the information system engineering project. (2) In the process of supervision, we should not only consider the control of phased objectives such as engineering planning, conceptual design, overall design, detailed design, coding implementation and testing, trial operation and acceptance maintenance, but also pay attention to process-based target control and driving, and change post-event control into pre-event prevention to minimize major design changes. (3) In the specific process management, the supervisor needs to fully consider the specific process of designing and realizing continuous iteration, so as to avoid major demand changes in the later stage of the project and protect the best interests of the owner and contractor. Therefore, the improvement goal of the supervision process of information system application system includes three aspects, namely, the performance control and continuous improvement of the contractor's development process; Based on the contractor's process management system, the supervisor's support and supervision for collaborative design are realized; Driven by process management, realize the milestone supervision goal of information system engineering implementation. 2. CMM-based system monitoring process 2. 1 Capability Maturity Model (LCMM) [6] is a description of each development stage of software organizations in the practice of defining, implementing, measuring, controlling and improving their software processes. The core of CMM is to regard software development as a process. According to this principle, software development and maintenance are monitored and studied, making it more scientific and standardized, and enabling enterprises to better achieve their business goals [7]. CMM defines five different maturity level processes: the first level is initial level, the second level is repeatable level, the third level is definition level, the fourth level is management level, and the fifth level is optimization level [8]. An organization can advance to a higher maturity level according to a series of small improvement steps [9]. With the improvement of CMM level, the visibility of information system engineering process is also improving. With the visualization of each process maturity level, managers can understand the relevant situation of the project and its implementation. More importantly, subsequent maturity levels can provide better visibility for software processes step by step [10]. Therefore, introducing CMM model in the process of information system supervision can increase the visualization of information system engineering implementation. 2.2 CMM-based system supervision capability process Because there will be problems at any stage of the software life cycle, for information system supervision, it is still impossible to completely eliminate all the problems of contractors in system development. However, in a suitable CMM framework, these problems can be predicted and controlled by the management and supervision unit. By referring to CMM model, the key characteristics of engineering project development can be measured scientifically and effectively, so as to realize the continuous improvement of project implementation. In addition, the process-centered approach can focus on the process, rather than the results and objectives of the project. For supervisors, the process-centered method has the following characteristics: (1) collecting accumulated data; (2) measuring development ability; (3) Scientific analysis of information content; (4) Manage the correlation of sub-processes. Therefore, through process-centered project development management, supervisors can identify, understand and solve those potential problems [1 1]. The supervision process and content of introducing CMM model can be described by table 1 Process improvement through measurement is one of the effective means to improve the ability of information system software supervision process. The idea of CMM guides the supervision organization to control the process of software product development and maintenance, and how to evolve into a mature information engineering supervision system and form a virtuous circle management mechanism, as shown in Figure 2. The realization of information supervision process under 3CMM 3. 1 The realization of CMM-based supervision process is at the level of CMM2, and more importantly, the software process is institutionalized for quality management. From the perspective of effective information system supervision, this management is the most basic guarantee of supervision quality [12]. At this level, supervision can directly define the supervision process according to the life cycle model of information system engineering. Taking waterfall model as an example, the supervision process can be defined as: requirement definition stage, overall design stage, detailed design stage, project implementation stage, system testing stage, acceptance stage and trial operation stage. According to software process improvement (SPI), process elements are divided into three categories. The main supervision contents in CMM3 level include: (1) process group of life cycle, represented by supply process, development process and maintenance process; (2) Process groups supporting life cycle, including configuration management, documentation, problem solving, quality assurance, peer review and inter-group coordination; (3) The process group of organizational life cycle, which is manifested in management, infrastructure, software process improvement, training and so on. 3.2 Continuous improvement of supervision process based on CMM For supervision institutions, the design and application of CMM2 model is not difficult, but it is not enough to meet the purpose of visualization of information system engineering implementation process, but only the visualization of milestones. To clearly describe the standard software process, it is not enough to only group the process elements, but more importantly, to describe the relationship between these process elements, which is usually called software process architecture [13]. For process supervision, the implementation of CMM3 or higher model can basically meet the requirements of information system engineering visualization. Taking CMM3 level as an example, the improvement of supervision process based on key process areas should be realized through the processes and activities such as project requirements management, software configuration activity management, software quality assurance process and system [14], software product process, tripartite review, software project tracking supervision, communication, coordination and association, so as to achieve the purpose of supervising project management. Conclusion Based on the business characteristics of information system engineering supervision, the milestone supervision goal of information system engineering implementation is realized through process management, and the improvement method of supervision process under CMM model is studied to improve the implementation quality of information system software supervision project. This paper focuses on the improvement of application system supervision process in information system engineering, which mainly depends on its important position in information system engineering. Many characteristics of information system engineering are mainly reflected by application system development control process, but the research results can also be applied to other aspects of information system engineering supervision. Of course, there are still some shortcomings in this paper, which can be summarized as follows: (1) Only the supervision process of information system engineering is studied and discussed, and the supervision work is far more than these, including a lot of methods and work; (2) In view of the current capability maturity level of information system engineering project contractors, the improvement of supervision process is only studied at the level of CMM3 capability, and the related issues of process improvement with higher CMM equivalent level are not further discussed. Therefore, these problems will be called the focus of the next research work.
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