The data flow diagram describes the logical model diagram of the system without any specific physical elements, but only describes the flow and processing of information in the system. Because data flow diagram is a graphic representation of logical system, it is easy for non-professional computer technicians to understand, so it is an excellent communication tool. In addition, the design of data flow diagram only needs to consider the basic logical functions that the system must complete, and does not need to consider how to realize these functions in detail, so it is also a good starting point for software design. The "student achievement management system" mainly manages students' basic information, achievements and other related information by computer. So the main data source should be all kinds of information of students. Please refer to the data flow chart below for details about their flow and processing in the system.

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