5.2 Data flow diagrams Flashcards
1
Q
External entity
A
A person, organisation, or device used outside the information system that originates or receives data.
2
Q
A process
A
Anything that changes the data and produces an output.
3
Q
Context diagram
A
A level 0 DFD used to give an overview of how information flows through a system
4
Q
Level 1 DFD
A
Decomposes a context diagram into sub-processes and adding data stores.
5
Q
Data store
A
Any real world store of data held, for example a computerised database or an inbox on someone’s desk.
6
Q
Data flow
A
Data between entities and processes
7
Q
A
