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LO5 Understand the process flow of information (5.2 Data flow diagrams…
LO5 Understand the process flow of information
5.2 Data flow diagrams
Rules and tips
Each process should at least one input and one output
Each data store should have at least one data flow in and one data flow out
Data stored in a system must go through a process
All processes in a DFD must go to another process or data store
Each external entity must have at least one input and one output
Data flows in one direction
Each data flow connects to at least one process
Symbols
Impacts affecting the flow of information in information systems
Complete or partial system faliure
Human error - data being lost, miss files, data being misfiled, data may be process incorrectly.
Breakdown in working relations and/or communications - delay in the flow of data, delay in the processing, delay in storage.
5.1 Information sources and data
Information sources
Internal sources
Financial
Personal
Marketing
Purchasing
Sales
Manufacturing
Administration
External sources
Supplier price list
Financial information from a third party
Survey results
Data types
Primary data / Secondary data
Qualitative data / Quantitative data
