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ATG 383 - CHAP 3

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

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

  2. Overview • Introduction • Why master system documentation techniques? • Drawing DFDs • Drawing Flowcharts

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

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

  5. 4 DFD Symbols - page 59

  6. 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. 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. 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. Context Diagram CPA AICPA Library System CPA

  10. 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. 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. 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. 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

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

  15. 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

  16. Flowcharting Symbols - p. 69

  17. Flowcharting Symbols

  18. Flowcharting Symbols

  19. Flowcharting Symbols

  20. Example 1 Payroll supervisor reviews a time card.

  21. 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.

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

  23. 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.

  24. To Have Success With Drawing DFDs & Flowcharts • Learn the symbols • Understand the system you are diagramming • Practice

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