Systems Design Chapter 05

Question 1

Binary Relationships

Answer 1

Relationship between two different types of things - i.e. customer and an order

Question 2

Unary Relationship (recursive)

Answer 2

Relationship among two things of the same type - such as one person married to another person

Question 3

Ternary Relationship

Answer 3

Relationship among three different types of things

Question 4

n-ary Relationship

Answer 4

Relationship among n (any number of) different types of things

Question 5

Attribute

Answer 5

one piece of specific information about a thing

Question 6

identifier key

Answer 6

an attribute that uniquely identifies a thing - (primary key in db)

Question 7

compound attribute

Answer 7

attribute that contains a collection of related attributes

Question 8

multiplicity

Answer 8

a synonym for cardinality

Question 9

cardinality

Answer 9

the number of associations that occur among specific things - 1:1 - 1:M - M:M

Question 10

Data Entities

Answer 10

things about which the system needs to store information in the traditional approach to information systems

Question 11

Entity Relationship Diagram ERD

Answer 11

The squares with the zero/one to many lines

Question 12

Associative Entity

Answer 12

A data entity that represents a many-to-many relationship between two other data entities

Question 13

Generalization/Specialization hierarchies

Answer 13

hierarchies that structure or rank classes from the more general superclass to the more specialized subclasses; sometimes called inheritance hierarchies

Question 14

inheritance

Answer 14

a concept that allows subclasses to share characteristics of their superclasses

Question 15

whole-part hierarchies

Answer 15

hierarchies that structure classes according to their components

Question 16

aggregation

Answer 16

whole-part relationship between an object and its parts

Question 17

composition

Answer 17

whole-part relationship in which the parts cannot be dissociated from the object

Question 18

use case

Answer 18

an activity the system performs

Question 19

user goal technique

Answer 19

an approach for identifying use cases in which an analyst talks to all users to get them to describe their goals in using the system

Question 20

CRUD technique

Answer 20

Create - Read/Report - Update - Delete an approach in which an analyst looks at each type of data and includes use cases that create the data - read or report on the data - updates the data - delete the data

Question 21

Elementary business process EBP

Answer 21

A task that is performed by one person - in one place - in response to a business event; it adds measureable business value and leaves the system and its data in a consistent state

Question 22

Event

Answer 22

an occurrence at a specific time and place that can be described and is worth remembering by the system

Question 23

Event Decomposition

Answer 23

an analysis technique that focuses on identifying the events to which a system must respond and then determining how the system must respond.

Question 24

External Event

Answer 24

An event that occurs outside the system - usually initiated by an external agent or actor

Question 25

Temporal Event

Answer 25

an event that occurs as a result of reaching a point in time

Question 26

state event

Answer 26

an event that occurs when something happens inside the system that triggers the need for processing. (internal events)i.e. sale of an item results in low stock - inventory reorder must take place

Question 27

System controls

Answer 27

checks or safety procedures put in place to protect the integrity of the system

Question 28

perfect technology assumption

Answer 28

the assumption that events should be included during analysis only if the system would be required to respond under perfect conditions.

Question 29

Event table

Answer 29

a catalog of use cases that lists events in rows and key pieces of information about each event in columns. Event/Trigger/Source/Use Case/Response/Destination

Question 30

Trigger

Answer 30

a signal that tells the system that an event has occurred - either the arrival of data needing processing or a point in time

Question 31

Source

Answer 31

an external agent or actor that supplies data to the system

Question 32

response

Answer 32

an output produced by the system that goes to a destination

Question 33

destination

Answer 33

an external agent or actor that receives the data from the system

Question 34

use case description

Answer 34

a description that lists the processing details for a use case

Question 35

actor

Answer 35

in UML diagrams a person who uses the system

Question 36

Scenario or use case instance

Answer 36

a unique set of internal activities within a use case that represents a unique path through the use case

Question 37

Brief Description

Answer 37

short paragraph of the use case

Question 38

Intermediate Description

Answer 38

Title - main flow & exception conditions

Question 39

Fully developed description

Answer 39

Contains use case name-scenario-triggering event-brief description-actors-related use cases - stakeholders -preconditions -postconditions -flow of activities - exception conditions.

Question 40

pre-conditions

Answer 40

conditions that must be true before a use case begins

Question 41

postconditions

Answer 41

conditions that must be true upon completion of the use case

Question 42

things

Answer 42

tangible - roles - organizational - devices - sites/locations - incidents/events/or interactions

Question 43

relationship

Answer 43

a naturally occurring association among specific things such as an order is placed by a customer and an employee works in a department