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ATG 383 - CHAP 3. Data Flow Diagrams and Flow Charts Spring 2002. Overview. Introduction Why master system documentation techniques? Drawing DFDs Drawing Flowcharts. Why learn how to document a system’s operation?. ?.

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Atg 383 chap 3

ATG 383 - CHAP 3

Data Flow Diagrams and

Flow Charts

Spring 2002


Overview
Overview

  • Introduction

    • Why master system documentation techniques?

  • Drawing DFDs

  • Drawing Flowcharts



Data flow diagrams show what a system does while flowcharts show how the work is done

Data flow diagrams showwhat a system doeswhile flowcharts showhow the work is done.



Example dfd
EXAMPLE DFD

CPAs send research requests to the AICPA library and

receive back bibliographies related to their questions. When the

request is received, the chief librarian checks the membership

data base (since searches are only done for members.) She also

reviews the requests to determine that it is appropriate. Rejected

requests are returned to the sender.

Approved requests are forwarded to a research librarian .

He searches the periodical index and prepares the

bibliography. This is sent to the CPA.


Inputs
Inputs?

CPAs send research requests to the AICPA library and

receive back bibliographies related to their questions. When the

request is received, the chief librarian checks the membership

data base (since searches are only done for members.) She also

reviews the requests to determine that it is appropriate. Rejected

requests are returned to the sender.

Approved requests are forwarded to a research librarian .

He searches the periodical index and prepares the

bibliography. This is sent to the CPA.


Outputs
Outputs?

CPAs send research requests to the AICPA library and

receive back bibliographies related to their questions. When the

request is received, the chief librarian checks the membership

data base (since searches are only done for members.) She also

reviews the requests to determine that it is appropriate. Rejected

requests are returned to the sender.

Approved requests are forwarded to a research librarian .

He searches the periodical index and prepares the

bibliography. This is sent to the CPA.


Context diagram
Context Diagram

CPA

AICPA Library System

CPA


Data moving through system
Data moving through system?

CPAs send research requests to the AICPA library and

receive back bibliographies related to their questions. When the

request is received, the chief librarian checks the membership

data base (since searches are only done for members.) She also

reviews the requests to determine that it is appropriate. Rejected

requests are returned to the sender.

Approved requests are forwarded to a research librarian .

He searches the periodical index and prepares the

bibliography. This is sent to the CPA.


Processing steps
Processing Steps

CPAs send research requests to the AICPA library and

receive back bibliographies related to their questions. When the

request is received, the chief librarian checks the membership

data base (since searches are only done for members.) She also

reviews the requests to determine that it is appropriate. Rejected

requests are returned to the sender.

Approved requests are forwarded to a research librarian .

He searches the periodical index and prepares the

bibliography. This is sent to the CPA.


Files used
Files used?

CPAs send research requests to the AICPA library and

receive back bibliographies related to their questions. When the

request is received, the chief librarian checks the membership

data base (since searches are only done for members.) She also

reviews the requests to determine that it is appropriate. Rejected

requests are returned to the sender.

Approved requests are forwarded to a research librarian .

He searches the periodical index and prepares the

bibliography. This is sent to the CPA.


Summary
Summary

  • CPA sends research requests

  • Chief librarian

    • checks membership database

    • reviews requests

    • approved requests to research librarian

    • rejects returned to sender

  • Research librarian

    • searches periodicals index

  • Bibliography sent to CPA


Level 0 dfd
Level 0 DFD

CPA

1.0

Review

Request

2.0

Create

Biblio.

CPA


Flowcharting general
FLOWCHARTING - GENERAL

  • We are concerned with document flowcharts.

  • These describe the physical operation of a system.

  • Variety of symbols needed to depict actual operations.

  • See Figure 3.8, page 69






Example 1
Example 1

Payroll supervisor reviews a time card.


Example 2
Example 2

  • Personnel department updates the personnel files based on information from a new employee’s application. The application is filed alphabetically. Two copies of a new employee form are sent to department x.


Example 3
Example 3

Batches of time cards are keyed into the payroll master disk file. Then the time cards are filed by date.


Example 4
Example 4

The personnel manager receives a change of status form which is keyed into the system and updates the master disk file. The system creates a confirmation of the change. The personnel manager compares this to the original request. Both documents are sent to the employee.


To have success with drawing dfds flowcharts
To Have Success With Drawing DFDs & Flowcharts

  • Learn the symbols

  • Understand the system you are diagramming

  • Practice


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