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CNIT 180 > Chapter 5 > Flashcards

Chapter 5 Flashcards

1
Q

Logical Model

A

Shows what the system must do, regardless of how it will be physically implemented

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2
Q

Physical Model

A

Describes how the system will be implemented

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3
Q

DFD

A

Data Flow Diagram: various symbols to show how the system transfers input data into useful information

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4
Q

Gane and Sarson Set

A

A type of DFD (Data Flow Diagram)

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5
Q

Yourdon

A

A type of DFD (Data Flow Diagram)

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6
Q

Process

A

receives input data and produces output that has a different content, form or both.

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7
Q

Business Logic/Business Rules

A

transforms the data and produces the required results

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8
Q

Black Box

A

a symbol where all inputs, outputs and general functions of the process are known, but the underlying details and logic of the process are hidden

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9
Q

Data Flow

A

path for data to move from one part of the information system to another

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10
Q

Spontaneous Generation

A

all outputs, no inputs

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11
Q

Black Hole

A

all inputs, no outputs

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12
Q

Gray Hole

A

the inputs are insufficient to produce the output

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13
Q

data store

A

represents data that the systems stores because one or more processes need to use the data at a later time

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14
Q

terminators

A

data origins or final destinations

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15
Q

source

A

an entity supplying the system with with data

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16
Q

sink

A

an entity that receives the information

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17
Q

context diagram

A

top-level view of an information system that shows the system’s boundaries and scope

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18
Q

parent diagram

A

higher level diagram

19
Q

child diagram

A

lower level diagram

20
Q

Diverging Data Flow

A

a data flow in which the same data travels to two or more different locations

21
Q

functional primative

A

a process that consists of a single function that will not explode further

22
Q

leveling

A

process of drawing a series of increasingly detailed diagrams until all functional primitives have been found

23
Q

Balancing

A

ensuring all input and output data flows align properly, helps maintain consistance

24
Q

Exploding

A

also called leveling, partitioning, or decomposing

25
Q

Data Dictionary/ Data Repository

A

central storehouse of information about the system’s data

26
Q

Data Element/ Data Field/ Data item

A

smallest piece of data that has meaning within an information system

27
Q

Records/ Data Structures

A

combined data elements

28
Q

Alias

A

an alternate name to a data element

29
Q

Type

A

whether the data element is numeric, alphabetic, or character values

30
Q

Length

A

maximum number of characters/digits/decimal points etc

31
Q

domain

A

set of values permitted for the data element

32
Q

source

A

specification for the origination point for the data elements values

33
Q

Security

A

identification or the individual/department that has access/update priveldges

34
Q

Responsible User

A

Identification of the user(s) responsible for entering/changing values for the data element

35
Q

Process Description

A

documents the details of a functional primitive and represents a specific set of processing steps and business logic

36
Q

modular designs

A

based on combinations of three logical structures, sometimes called control structures

37
Q

sequence

A

the completion of steps in a sequential order one after another

38
Q

selection

A

the completion of one of two or more process steps based on the results of a test or condition

39
Q

Iteration

A

the completion of a process step that is repeated until a specific condition changes, also called looping

40
Q

Structured English

A

a subset of standard English that describes logical processes clearly and accurately

41
Q

pseudocode

A

structured English that might look familiar to programming students . Is a mix of code and structured english

42
Q

decision table

A

a logical structure that shows every combination of conditions and outcomes

43
Q

decision tree

A

a graphical representation of the conditions, actions and rules found in a decision table

44
Q

four-model approach

A

develop a physical model of old system, a logical model, of old system, a logical model of the new system, a physical model of the new sytem

CNIT 180 (7 decks)

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