Data flow analysis is the process of abstractly LEUNG Chi hong separating the flow of data within an organization, leaving out the specific organization, information carrier, processing work, materials and materials, and so on, and examining the actual business processing mode only from the data flow process, which primarily includes the analysis of information flow, transmission, processing, and storage, among other things.
The goal of data flow analysis is to identify and resolve problems in the data flow process, such as poor data flow, data mismatch before and after processing, and unreasonable data processing.
The Data Dictionary is a collection of definitions and descriptions for all of the elements in a data flow diagram. Data items, data structure, data flow, data storage, processing logic, and external entities are among these elements.
The Data Flow Dictionary entry "Processing Logic" can only describe some simple processing logic in detail, but not some complex processing logic. Some tools must be used to describe the complex processing logic in detail in order to express the entire system function clearly. The majority of these tools are structured languages, decision trees, and decision tables.
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The system analysis report is the output of the system analysis stage, and it serves as a summary and compilation of the system analysis work as well as a guide for the next stage of system design work. In general, the system analysis report has four major sections: introduction, overview of the current system, logical scheme of the new system, and implementation plan.
System design is the process of creating a physical model based on the logical model of a new system, that is, carrying out specific design, determining the system's implementation plan, and solving the problem of "how to do" the system based on the logical functional requirements of the new system combined with the actual conditions.
The outline design phase's main task is to complete the structural framework design and the overall system structure design; the detailed design phase's main task is to complete the system code design, data file/database design, input/output design, and module processing process design, among other tasks.
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