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ATG 383 - Chapter 3 ATG 383 - CHAP 3 Data Flow Diagrams and Flow Charts Spring 2002.

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Presentation on theme: "ATG 383 - Chapter 3 ATG 383 - CHAP 3 Data Flow Diagrams and Flow Charts Spring 2002."— Presentation transcript:

1 ATG Chapter 3 ATG CHAP 3 Data Flow Diagrams and Flow Charts Spring 2002

2 ATG Chapter 3 Overview l Introduction »Why master system documentation techniques? l Drawing DFDs l Drawing Flowcharts

3 ATG Chapter 3 Why learn how to document a system’s operation? ?

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

5 ATG Chapter 3 4 DFD Symbols - page 59

6 ATG Chapter 3 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.

7 ATG Chapter 3 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.

8 ATG Chapter 3 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.

9 ATG Chapter 3 Context Diagram AICPA Library System CPA

10 ATG Chapter 3 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.

11 ATG Chapter 3 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.

12 ATG Chapter 3 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.

13 ATG Chapter 3 Summary l CPA sends research requests l Chief librarian »checks membership database »reviews requests »approved requests to research librarian »rejects returned to sender l Research librarian »searches periodicals index l Bibliography sent to CPA

14 ATG Chapter 3 Level 0 DFD CPA 1.0 Review Request 2.0 Create Biblio. CPA

15 ATG Chapter 3 FLOWCHARTING - GENERAL l We are concerned with document flowcharts. l These describe the physical operation of a system. l Variety of symbols needed to depict actual operations. l See Figure 3.8, page 69

16 ATG Chapter 3 Flowcharting Symbols - p. 69

17 ATG Chapter 3 Flowcharting Symbols

18 ATG Chapter 3 Flowcharting Symbols

19 ATG Chapter 3 Flowcharting Symbols

20 ATG Chapter 3 Example 1 Payroll supervisor reviews a time card.

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22 ATG Chapter 3 Example 2 l 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.

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24 ATG Chapter 3 Example 3 Batches of time cards are keyed into the payroll master disk file. Then the time cards are filed by date.

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26 ATG Chapter 3 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.

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28 ATG Chapter 3 To Have Success With Drawing DFDs & Flowcharts l Learn the symbols l Understand the system you are diagramming l Practice


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