The Research On The Impact Of Requirement Change In Software Project Based On System Dynamics

With the growing scale of software products, the complexity of software projects is also rising. Complex software systems in all fields of national development has been rapid development, which also makes software products become more essential to be an important part for life. The dependence of software products increased on the one hand to facilitate people’s lives, it also makes the process of software development projects under increasing attention. Therefore, the impact of software project performance problems in the software development process also caused widespread concern. Software Requirements with volatility, changing demand makes the software development process is facing many problems in technical, economic and management, an important factor for software development projects and is recognized.In more than medium-scale software projects, the demand for new projects arising from the previous stage and errors often undiscovered after passing influence on the implementation stage, the stage of pre-discovery stage when there are new demands and needs of the previous stage rework errors, which mutual influence between species is often transitive, nonlinear, time delay, crossover occurs, which is difficult to express in traditional Gantt chart, critical path method, it is difficult to be a good discussion and handling. Therefore, the use of system dynamics approach needs to change software project impact study phenomena can overcome traditional project management research deficiencies.Firstly, the thesis overviews the theory of the demand for software project change and system dynamics, and reviews the system dynamics research in the field of software projects and software project requirement change research; then analyzes the impact of requirement changes to the software projects, and establishes a software project system dynamics model with requirement change, including the basic subsystem, the subsystem of human resources, project duration and project schedule pressure subsystem, project cost subsystem; once again analyzes the software project development model, which includes the initial model, the pressure in progress under the model changes affect the demand for software projects, but also to study the impact of requirements changes and personnel changes frequency of the software project; in addition, according to the change impact to set up an improved software project model, and does the model simulation, analysis and control changes to the scope, change additional personnel time and integrated approach to the impact of software projects. Finally, the research process is summarized innovation and research, and points out the limitations of existing and future research directions.