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A treats the entire information system as one process, showing the inputs to the system from sources and outputs from the system to destinations. a

treats the entire information system as one process, showing the inputs to the system from

sources and outputs from the system to destinations.

.

level

- 0

DFD

.

context diagram

.

entity

-

relationship diagram

.

extended entity

-

relationship diagram

.

conceptual model

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