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Unit 2 L05 - Understand the process flow of information - Coggle Diagram
Unit 2 L05 - Understand the process flow of information
5.1 Information sources and data types
primary data
secondary data
external source
Qualitative data and quantitative data
internal source
purpose
5.2 Data flow diagrams (DFDs)
Data flows
Standard symbols used
Data stores
Connectivity rules for drawing level 1 DFDs
Data flows only in one direction
every data flow is labelled
at least one input or output for each external entity
very data flow connects to at least one process
at least one input data flow and/ or at least one output data flow for each process
Processes
Impacts affecting the flow of information in information systems
External entities