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2nd Sem > SAD5 > Flashcards

SAD5 Flashcards

1
Q

Data Flow Diagram

A

shows the data movements through information system but does not show program logic of process steps

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2
Q

DFD Symbols

A
  • Gane and Sarson
  • Yourdon
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3
Q

DFD Symbol Names

A
  • process
  • data flow
  • data store
  • external entity
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4
Q

Process

A

receives an input and produces an output thas has a different content, form or both

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5
Q

business rules/business logic

A

transforms data into required results

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6
Q

blackbox

A

inputs, outputs, functions are known but underlying details and logic arr hidden

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7
Q

data flow

A

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

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8
Q

data flow types

A
  1. spontaneous generation
  2. black hole
  3. gray hole
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9
Q

spontaneous generation

A

produces output, but has no input data flow

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10
Q

black hole

A

which is a process that has input, but produces no output.

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11
Q

data store

A
  • represent data that the system stores because one or more processes need to use the data at a later time
  • connected into a process with a data flow
  • does not show the detailed contents of data store
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12
Q

Entity

A
  • rectangle with noun inside
  • DFD shows external entities that provide data to the system and receive output from system
  • DFD shows boundaries of the system and how system interfaces with outside world
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13
Q

DFD known as terminators

A

because they are the origin and data’s final destination

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14
Q

Source

A

entity that supplies data

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15
Q

sink

A

entity that receives data

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16
Q

Creating a set of dfd

A

Create a graphical model of the information system based on your fact-finding results

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17
Q

Step 1: Draw Context Diagram

A

top-level view of an information system that showsits boundaries and scope

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18
Q

Step 2: Draw Diagram 0 DFD

A

To show the deta il inside the black box,
you create DFD diagram 0

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19
Q

diverging data flow

A

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

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20
Q

parent diagram

A

When you explode a DFD, the higher-level diagram

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21
Q

child diagram

A

lower-level diagram

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22
Q

functional primitive

A

process that consists of a single function that is not exploded further

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23
Q

Step 3: Draw the Lower Level Diagrams
Leveling and Balancing

A

lower-level DFDs

24
Q

Leveling

A

process of drawing a series of increasingly detailed diagrams, until all functional primitives are identified

25
Q

Balancing

A
  • maintains consistency among a set of DFDs by ensuring that input and output data flows align properly
  • ensures that the input and output data flows of the parent DFD are maintained on the child DFD
26
Q

data dictionary or data structures

A
  • central storehouse of information about
    the system’s data
  • collect, document, and organize specific facts about the system, including the contents of data flows, data stores,
    entities, and processes
27
Q

data element/item/field

A

smalles piece of data that has a meaning within the information system

28
Q

record

A

meaningful combination of related data elements that is included in a data flow or retained in a data store

29
Q

CASE Tools for Documentation

A
  • The more complex the system, the more difficult it is to maintain full and accurate documentation
  • modern CASE tools simplify the task
  • CASE repository ensures data consistency
30
Q

Documenting the Data Elements

A
  • You must document every data element in the data dictionary
  • The objective is the same: to provide clear, comprehensive information about the data and processes that make up the system
31
Q

Attributes usually are recorded and described in the data dictionary

A
  1. data element name or label
  2. alias
  3. type and length
  4. dafualt value
  5. acceptable value
  6. source
  7. security
  8. description and comments
32
Q

data element name or label

A

standard name of the element

33
Q

alias

A

other than the standard name of elements

34
Q

type and length

A
  • Type refers to whether the data element contains numeric, alphabetic, or character values
  • length maximum number of characters for an alphabetic or character data element or the maximum number of digits and number of decimal positions for a numeric data element
35
Q

default value

A

value of data element if nothing was entered

36
Q

Acceptable Value

A

domain is the permitted set of values for data element
validity rules refers to the value for data element

37
Q

Source

A

origination point of data element

38
Q

security

A

individual/department that has access for each data element

39
Q

Responsible user(s)

A

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

40
Q

Description and comments

A

allows you to enter additional notes

41
Q

Documenting the Data Flows

A
  1. Data flow name or label
  2. Alternate name
  3. Description
  4. Origin
  5. Destination
  6. Record
  7. Volume and Frequency
42
Q

Documenting Data Process

A

1.Process name or label
2.Description
3.Process number
4.Process description

43
Q

Documenting Data Store

A
  1. Date store name or label
  2. Alternate name
  3. description
  4. attributes
  5. volume and frequency
44
Q

Documenting entities

A
  1. entity name or label
  2. description
  3. alternate name
  4. input data flow
  5. output data flow
45
Q

Documenting data records

A
  • record or data structure name
  • alternate name
  • description
  • attributes
46
Q

data dictionary report

A
  • alphabetized list of all data elements by name
  • report describing each data element and indicating the user or department that is responsible for data entry, updating, or deletion
  • A report of all data flows and data stores that use a particular data element
  • reports showing all characteristics of data elements, records, data flows, processes, or any other selected item stored in the data dictionary
47
Q

data dictionary report

A
  • alphabetized list of all data elements by name
  • report describing each data element and indicating the user or department that is responsible for data entry, updating, or deletion
  • A report of all data flows and data stores that use a particular data element
  • reports showing all characteristics of data elements, records, data flows, processes, or any other selected item stored in the data dictionary
48
Q

Modular design

A

combination of three logical structures that serve as the building blocks for the process

49
Q

sequence

A

refers to the completion of steps in a sequencial manner

50
Q

selection

A

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

51
Q

iteration aka looping

A

completion of a process step that is repeated until a specific condition changes

52
Q

structured english

A

subset of standard English that describes logical processes clearly and accurately

rules:
* use only the three building blocks (sequence, selection, iteration)
* use indention for readability
* use limited vocubulary that includes standard terms

53
Q

decision table

A
  • shows logical structure, with all possible combinations of conditions and resulting actions
  • often are the best way to describe a complex set of conditions
54
Q

decision tree

A

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

55
Q

logical model

A

tool used to deevlop physical model

56
Q

physical model

A

shows system requirement implemented

57
Q

Four-Model Approach

A
  • physical model of the current system
  • logical model of the current system
  • logical model of the new system
  • Physical model of the new system

2nd Sem (21 decks)

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