Individual DFD Assignment - PowerPoint PPT Presentation

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Individual DFD Assignment

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Title: PowerPoint Presentation Author: Dave Harris Last modified by: wildcat Created Date: 1/24/2003 7:49:39 AM Document presentation format: On-screen Show (4:3) – PowerPoint PPT presentation

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Title: Individual DFD Assignment


1
Individual DFD Assignment
2
Library Information System
  • The University library system records the books
    owned by the library as well as any new books
    purchased and put into circulation. Before
    someone can borrow a book, he or she must show a
    valid ID card that is checked to ensure that it
    is still valid against the student files
    maintained by the registrars office (for student
    borrowers), the faculty/staff files maintained by
    the personnel office (for faculty/staff
    borrowers), or the librarys own guest file (for
    individuals issued a guest card by the library).
    The system must also check to ensure the borrower
    does not have any overdue books or unpaid fines
    before he or she can borrow another book. If no
    fines or overdue books are found, the book is
    checked out. The system should record who has
    borrowed what book and when it is due back. The
    borrower is also told the due date. Books can
    only be checked out for two weeks. When a book
    is overdue, the information about the book and
    the person who checked it out is added to an
    overdue file. Every Monday, the library prints
    and mails postcards to those people with overdue
    books. If a book is overdue by more than one
    month, a fine will be imposed and a librarian
    will telephone the borrower to remind him or her
    to return the book.

3
Library Information System
  • Task at Hand
  • You are to create a Context diagram as well as a
    Level 1 decomposition of the Library Information
    System
  • The processes described on the previous slide
    must be represented in the Level 1 decomposition
  • All relevant data stores must be represented in
    the Level 1 decomposition
  • A USD diagram is to be created that depicts the
    existing system ichnographically
  • An entity relationship diagram, using correct
    cardinality notation, is to be included to
    represent the relationship between the different
    data stores

4
Library Information System
  • Data Flow Diagrams
  • Context diagram should highlight boundaries
  • 1st level decomposition should cover general
    functions
  • Entity Relationship Diagram
  • Basic relationships between data stores
  • User System Diagram
  • Reflect Context level 1 decomposition functions
  • Diagrams can be created using VISIO (via citrix),
    using MS word, or any other drawing tool
  • Proper notation for cardinality should be user
    in the ERD
  • Proper symbols must be used for the DFD
  • DUE April 16th by 500 pm
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