What is the meaning of the line segment with arrowheads in the data flow diagram

What is the meaning of the line segment with arrowheads in the data flow diagram? I believe that many inexperienced people are at a loss about this, so this article summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

The line segments with arrows in the data flow graph represent the data flow. In the data flow diagram, the rectangle represents the external entity of the data, the rounded rectangle represents the processing logic of the transformed data, and the double horizontal lines represent the storage of the data. Data flow diagrams are tools used in structured analysis methods.

The line segments with arrows in the data flow graph represent the data flow.

Related introduction:

Data flow diagram is a tool used in structured analysis methods, which graphically describes the process of data flow and processing in the system. Because it only reflects the logical functions that the system must complete, it is a functional model.

In the structured development method, the data flow diagram is the result of the requirements analysis phase.

In the data flow diagram, the rectangle represents the external entity of the data, the rounded rectangle represents the processing logic of the transformed data, and the double horizontal lines represent the storage of the data.

The data flow chart includes:

Data symbols that indicate the existence of the data, which can also indicate the media used by the data

The processing symbols that indicate the processing performed on the data, and these symbols can also indicate the machine functions used in the processing

Streamline symbols that indicate several data streams between processing and / or data media

A special symbol that is easy to read and write data flow charts.

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