CHP 7 Flashcards
What is a picture of the movement of data between external entities and the processes and data stores within a system?
Data Flow Diagram (DFD)
What is Data Store?
Data at rest, which may take the form of many different physical representations
What is Process?
The work/action performed on data so that they are transformed, stored, or distributed
The origin/destination of data; sometimes referred to as external entities is?
Source/Sink
What is a Context Diagram?
overview of an organizational system that shows the system boundaries, external entities that interact with the system, and the major information flows between the entities and the system
A DFD that represents a system’s major processes, data flows, and data stores at a high level of detail
Level-0 diagram
What is Functional Decomposition?
iterative process of breaking the description of a system down into finer detail
A DFD that is the result of n nested decompositions from a process on a level-o diagram
Level-n diagram
What is Balancing?
conversation of inputs and outputs to a DFD process when that process is decomposed to a lower level
DFD Completeness?
extent to which all necessary components of a DFD have been included and fully described
DFD consistency?
extent to which information contained on one level of a set of nested DFDs is also included on other levels.
Gap Analysis
process of discovering discrepancies b/w 2 or more sets of DFDs
Decision Table?
matrix representation of the logic of a decision, which specifies the possible conditions for the decision and resulting action
Condition Stubs?
part of a decision table that lists the conditions relevant to the decisions
Action Stubs?
part of decision table that lists the actions that result for a given set of conditions
