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Questions and Answers
A data store or data repository is used in a data-flow diagram to represent a situation when the system must retain ______ because one or more processes need to use the stored data in a later time.
A data store or data repository is used in a data-flow diagram to represent a situation when the system must retain ______ because one or more processes need to use the stored data in a later time.
data
A data-flow is a path for ______ to move from one part of the information system to another.
A data-flow is a path for ______ to move from one part of the information system to another.
data
A data-flow may represent a single data ______ such the Customer ID or it can represent a set of data element (or a data structure).
A data-flow may represent a single data ______ such the Customer ID or it can represent a set of data element (or a data structure).
element
Because every process changes data from one form into another, at least one data-flow must ______ and one data-flow must exit each process symbol.
Because every process changes data from one form into another, at least one data-flow must ______ and one data-flow must exit each process symbol.
Data cannot move directly from an entity to a ______ without being processed.
Data cannot move directly from an entity to a ______ without being processed.
Data cannot move directly from one ______ to another without being processed.
Data cannot move directly from one ______ to another without being processed.
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Study Notes
Data Store
- A data store or data repository is used in a data-flow diagram to represent a situation where the system must retain data for later use by one or more processes.
- A data store must be connected to a process with a data-flow.
- Each data store must have at least one input data-flow and at least one output data-flow (even if the output data-flow is a control or confirmation message).
Data Flow
- A data-flow is a path for data to move from one part of the information system to another.
- A data-flow can represent a single data element (e.g. Customer ID) or a set of data elements (or a data structure).
- Notation:
- Straight lines with incoming arrows represent input data flow.
- Straight lines with outgoing arrows represent output data flows.
Data Flow Rules
- At least one data-flow must enter and one data-flow must exit each process symbol because every process changes data from one form into another.
- Data cannot move directly from an entity to a data store without being processed.
- Data cannot move directly from a data store to an external entity without being processed.
- Data cannot move directly from one data store to another without being processed.
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