Home  >  Article  >  Four elements of data flow diagram

Four elements of data flow diagram

王林
王林Original
2019-10-30 15:37:2234368browse

Four elements of data flow diagram

The four elements of the data flow diagram are:

1. External entities, people or transactions outside the system and related to the system, which express the external aspects of the system data Source and destination;

2. Data processing, the logical processing capability of data, that is, the exchange function of data;

3. Data storage, a general term for the logic after certain data is saved, It does not refer to the physical location and physical medium where the data is stored;

4. Data flow, the input or output of the processing function (the arrow indicates the direction of data flow).

The above is the detailed content of Four elements of data flow diagram. For more information, please follow other related articles on the PHP Chinese website!

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Previous article:Boot 00007b blue screenNext article:Boot 00007b blue screen