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