Non-computer tools are used to assist understanding of how the processing in an information system transforms data into information.
![Picture](/uploads/4/8/7/3/48736149/3130648_orig.jpg)
Documentation is written to explain the procedures for processing. It may be a detailed description of the processes or a set of steps to be followed. Documentation in the form of user manuals is provided by software companies to explain their products.
![Picture](/uploads/4/8/7/3/48736149/3122177.png?324)
Data flow diagrams (DFDs) are a graphical method of representing a system using a number of processes together with inputs, outputs and storage. DFDs focus on the flow of data between information processes in a system.