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34 Cards in this Set

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abstract class
a class that cannot be instantiated (no objects can be created), existing only to allow subclasses to inherit its attributes, methods, and associations
activity
behavior that the system performs when an event occurs (similar to a use case)
aggregation
whole-part relationship between an object an its parts
associated entity
a data entity that represents a many-to-many relationship between two other data entities
attribute
one piece of specific information about a thing
cardinality
the number of associations that occurs between specific things, such as a customer places many order and an employee works in one department
class
the type of classification to which all similar objects belong
composition
whole-part relationship in which the parts can not be dissociated from the object
compound attribute
an attribute that contains a collection of related attributes
concrete class
a class that can be instantiated (objects can be created)
data entities
the thing the system needs stores the information about in the traditional approach to information systems.
Descriptive Model
narrative memos reports, or lists that describe some aspect of a system
destination
an external agent or actor that receives data from the system
encapsulation
covering or protecting each object so that it contains values for attributes and methods for operation on those attributes, making the object a self-contained (and protected) unit
Event
an occurrence at a specific time and place that can be described and is worth remembering
Event Table
a table that lists events in rows and key pieces of information about each event in columns
External Event
an event that occurs outside the system, usually initiated by an external agent or actor
generalization/specialization hierarchies
hierarchies that structure or rank classes from the more general superclass to the more specialized subclasses; sometimes called inheritance hierarchies
Graphical Model
diagrams and schematic representations of some aspect of a system
identifier
attribute that uniquely identifies a thing
inheritance
a concept that allows subclasses to share characteristics of their superclasses
Mathematical Modeling
a series of formulas that describe technical aspects of a system
methods
the behaviors all objects of the class are capable of doing
multiplicity
a synonym for cardinality (used with the object-oriented approach)
Perfect technology assumption
the assumption that events should be included during analysis only if the system would be required to respond under perfect conditions
relationship
a naturally occurring association among specific things, such as an order is placed by a customer and an employee works in a department
response
an output, produced by system, that goes to a destination
source
an external agent or actor that supplies data to the system
State Event
an event that occurs when something happens inside the system that triggers the need for processing
System Controls
checks or safety procedures put in place to protect the integrity of the system
Temporal Event
an event that occurs as a result of reaching a point in time
trigger
a signal that tells the system that an event has occurred, either the arrival of data needing processing or of a point in time
use case
a series of actions that a system performs that result in a defined outcome (similar to activity)
whole part hierarchies
hierarchies that structure classes according to their associated components