Term
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Definition
| depicts and entity or a process within which incoming data flows are transformed into outgoing data flows |
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Definition
| represents a pathway for data |
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Definition
| portrays a source or a destination of data outside the system |
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Definition
| represents a place where data are stored |
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Term
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Definition
| graphical representation of a system. it depicts system's components; the data flows among the components; and the sources, destinations, and storage of the data |
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Term
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Definition
| top-level, least detailed, diagram of a system that depicts the system and all of its activities as a single bubble and show the data flows into and out of the system and into and out of the external entities. |
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Term
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Definition
| outside the system that send data to, or receive data from, the system. |
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Term
| Physical Data flow diagram |
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Definition
| graphical representation of a system showing the system's internal and external entities and the flows of data into and out of these entities. They specify where, how and by whom a system's activities are accomplished, not what activities. |
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Definition
| entity within the system that transforms data. These include accounting clerks, departments, and computers. |
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Term
| Logical data flow Diagrams |
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Definition
| graphical representation of a system showing the system's processes, data stores, and the flows of data into and out of the processes and data stores. Specifies what activities the system is performing. |
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Definition
| top-level view of the context diagram that has all numbers with a decimal 0 after it. |
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Term
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Definition
| When there are two DFD's, the context and level "0" with equivalent external data flows. |
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Definition
| successive subdividing, or "exploding" of logical DFD's, which leads to a set of balanced DFD's. |
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Term
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Definition
| graphical representation of a business process, including info processes as well as operations processes. They depict the sequence of activities performed as the business events flow through the process. |
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Term
| Two Main Ways to use DFD's |
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Definition
1. document and existing system
2. crease from scratch when developing a new system. |
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Term
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Definition
| any action being performed by an internal or external entity. They can relate to data or an operations process. |
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| Information Processing Activity |
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Definition
| retrieve data from storage, transform data, or file data. These include document preparation, data entry, verification, classification, arrangement and sorting, calculation, summarization, and filing. |
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Term
| Exception Routines(Error Routines) |
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Definition
| when processing can't be proceed as planned and out of the ordinary situations happen where processing is performed in other than normal situations. |
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Term
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Definition
| data flow assigned the label "reject" that leaves a bubble but does not go to any other bubble or data store. |
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| Computer-processing Rectangle |
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Definition
| The only way to get data into or out of a computer data storage unit. |
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Term
| Changes if using Enterprise systems |
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Definition
| 1. instead of 2 computer data stores, we would have one data store/disk symbol that would be labeled "enterprise database". |
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