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LO5: Understand the process flow of information (5.2 data flow diagram…
LO5: Understand the process flow of information
5.1 information sources and data
information sources
external sources
supplier price list
financial information from a third party
survey results
internal sources
financial
personnel
marketing
sales
manufacturing
purchasing
administration
data type
primary data
secondary data
qualitative data
quantitative data
5.2 data flow diagram
rules and tips
each process should have 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 through another process or data store
each external entity must have at least on input or output
data flows in one direction
each data flow connects to at least one process
symbols
external entity
process
data flow
data store
impacts affecting the flow of information in formation systems
complete of partial failure. delay in the flow of data
human error. data being lost/misplaced/processed incorrectly
breakdown in working relations and/or communication. delay in the flow of data/processing/storage