exam 2

Question 1

use case diagram

Answer 1

A diagram that depicts the interactions between the system and external systems and users. Graphical representation of who will use the system and what the user expects.

Question 2

use case modeling

Answer 2

the process of modeling a systems functions in terms of business events, who initiated the events and how the system responds to those events

Question 3

benefits of use case modeling

Answer 3

• provides tool for capturing functional requirements
• assists in decomposing system into manageable pieces
• provides aid in estimating project scope

etc.

Question 4

actor

Answer 4

anyone or anything that needs to interact with the system to exchange information

Question 5

four types of actors

Answer 5

primary business actor
primary system actor
external server actor
external receiver actor

Question 6

primary business actor

Answer 6

the stakeholder that primarily benefits from the execution of the use case

the employee receiving the paycheck

Question 7

primary system actor

Answer 7

the stakeholder that directly interfaces with the system to initiate or trigger the business or system event

the bank teller entering the transaction info

Question 8

external server actor

Answer 8

the stakeholder that responds to a request from the use case

the credit bureau authorizing a credit card charge

Question 9

external receiver actor

Answer 9

the stakeholder that is not the primary actor but receives something of value from the use case

Question 10

the process of requirements use case modeling

Answer 10

1. identify business actors
2. identify business use cases
3. construct use case model diagram
4. document business requirements use case narratives

Question 11

Data flow diagram

Answer 11

a process model used to depict the flow of data through a system and the work or processing performed by the system

Question 12

logical model development stages

Answer 12

1. context data model
   - only entities and relationships(to establish project scope)
2. key based data model
   - eliminate nonspecific relationships/add associative entities
   - include primary and alternate keys
3. fully attributed data model
   - sub setting criteria
4. normalized data model

Question 13

data analysis

Answer 13

used to improve a data model for implementation as a database

Question 14

normalization

Answer 14

organizes data into groups to form non-redundant, stable, flexible, and adaptive entities

Question 15

1nf

Answer 15

entity whose attributes have no more than one value for a single instance of that entity

Question 16

2nf

Answer 16

entity whose non primary key attributes are dependent on the fill primary key

Question 17

3nf

Answer 17

entity whose non primary key attributes are not dependent on any other non primary key attributes

Question 18

process modeling

Answer 18

a technique used to organize and document a systems processes

Question 19

function (process modeling)

Answer 19

a set of related and ongoing activities of a usiness

Question 20

event (process modeling)

Answer 20

a logical unit of work that must be completed as a whole. sometimes called a transaction.

Question 21

elementary process (process modeling)

Answer 21

a discrete, detailed activity or task required to complete the response to an event. also called primitive process

Question 22

context data flow diagram

Answer 22

a process model used to document the scope for a system. also called the environmental model

Question 23

policy (process modeling)

Answer 23

a set of rules that govern show a process is to completed

Question 24

decision table

Answer 24

a tabular form of presentation that specifies a set of conditions and their corresponding actions