What are the tasks and steps of information system design?

The task of system design is to determine which programs the functional modules of the system should be composed of in the computer and how to connect them together to form the best internal structure of the system according to the system analysis documents. At the same time, we need to use some tools to express the design results. In addition, considering the need to realize the system functions, it is necessary to carry out detailed database design, coding design, input/output interface (man-machine interface) design and other steps. The first step is the physical design of the database. The second step is coding design. The third step is to design the interface. The fourth step is the system function design.