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A & D
Exam 2 - Terms
13
Computer Science
Undergraduate 4
10/22/2009

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Term
Use Case Narrative
Definition
is a textual description of the business event and describes how the user interacts with the system to accomplish the task
Term
Entity instance
Definition
a single occurrence of an entity
Term
Associative entity
Definition
an entity that inherits its primary key from more than one other entity
Term
Normalization
Definition
a data analysis technique that organizes data into groups to form non-redundant, flexible, and adaptive entities
Term
Cardinality
Definition
defines the minimum and maximum number of occurrences of one entity for a single occurence of the related entity
Term
Concatenated key
Definition
a group of attributes that uniquely identifies an instance of an entity
Term
Balancing
Definition
the conservation of inputs and outputs to a process when that process is decomposed to a lower level of DFD
Term
Functional deomposition
Definition
is the act of breaking a system into component subsystems, processes and sub-processes
Term
Black hole
Definition
a process that has inputs but no outputs
Term
gray hole
Definition
is when the inputs are insuffiecient to produce the output
Term
miracle
Definition
a process that has outputs but no inputs
Term
Data flows
Definition
data in motion
Term
Data stores
Definition
data at rest
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