ISO 5807:1985 pdf download.Information processing 一Documentation symbols and conventions for data, program and system flowcharts,program network charts and system resources charts
1 Scope and field of application
This International Standard specifies symbols to be used in in-formation processing documentation and gives guidance on the conventions for their use in
a) data flowcharts;
b) program flowcharts;
c) system flowcharts;
d) program network charts;
e) system resources charts.
2 Reference
ISO 2382/1, Data processing - Vocabulary 一Part 01: Fun-damental terms. 1)
3 Definitions
For the purpose of this International Standard the definitions in ISO 2382/1 and the following apply.
3.1 basic symbol: Symbol used when the precise nature or form of, for example, the process or data media is not known or when it is not necessary to depict the actual medium.
3.2 specific symbol: Symbol used when the precise nature or form of, for example, the process or data media is known and when it is necessary to depict the actual medium.
3.3 flowchart: Graphical representation of the definition,analysis, or method of solution of a problem in which symbols are used to represent operations, data, flow, equipment, etc.
4 Data flowchart
Data flowcharts represent the path of data in the solving of a problem and define processing steps as well as the various data media used.
A data flowchart consists of
a) data symbols to indicate the existence of data; they may also indicate the medium used for this data;
b) process symbols to indicate the process to be executed on data; they may also indicate the machine function which is used for this process;
c) line symbols to indicate the data flow between pro-cesses and/ or data media;
d) special symbols to facilitate the reading and the writing of the flowchart.
By definition, process symbols should be preceded and fol-lowed by data symbols. A data flowchart begins and ends with data symbols (except special symbols as specified in 9.4).
5 Program flowchart
Program flowcharts represent the sequence of operations in a program.
A program flowchart consists of
a) process symbols for the actual processing operations including symbols that define the path to be followed taking into account the logical conditions;
b) line symbols to indicate the flow of control;
c) special symbols to facilitate the reading and the writing of the flowchart.
6 System flowchart
System flowcharts represent the control of operations and the data flow of a system.
A system flowchart consists of
a) data symbols to indicate the existence of data; they may also indicate the medium used for this data;
b) process symbols to indicate the operations to be executed on data, as well as to define the logical path to be followed;
c) line symbols to indicate data flow between processes and/or data media as well as the control flow between processes;
d) special symbols to facilitate the reading and writing of the flowchart.ISO 5807 pdf download.