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Information System Design IT60105

Information System Design IT60105. Lecture 5 Introduction to Information System Design. Lecture #5. Concepts of Function-Oriented Design Concepts of Object-Oriented Design Function-Oriented Design vs. Object-Oriented Design Case Study: Library Information System (LIS).

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Information System Design IT60105

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  1. Information System DesignIT60105 Lecture 5 Introduction to Information System Design Information System Design IT60105, Autumn 2007

  2. Lecture #5 • Concepts of Function-Oriented Design • Concepts of Object-Oriented Design • Function-Oriented Design vs. Object-Oriented Design • Case Study: • Library Information System (LIS) Information System Design IT60105, Autumn 2007

  3. Function-Oriented vs. Object-Oriented • Function-oriented approach • Decomposition of a system from the functional point of view • Identifies functions • Decompose complex functions into less simpler sub-functions • Object-oriented approach • Decomposition of a system from the object point of view • Identifies objects • Decompose complex objects into simpler objects Note: Both approaches follow Divide & Conquer strategy Information System Design IT60105, Autumn 2007

  4. Case Study: Library Information System • Problem Description • Users point of view: • Three types of users are there • Borrowers (perform transactions with the system) • Library Management Personnel (who responsible for providing service, maintenance, administration, ... etc.). Further they can be divided into two types • Library Assistants (support to the Borrowers for their transactions ) • Library Managers (responsible for overall maintenance and management of the library) • Suppliers (who supply books, response to quotations etc.) Information System Design IT60105, Autumn 2007

  5. Case Study: Library Information System • Problem Description • Functional point of view: • Privileged services for the Borrowers • Get registration • Membership renew • Search book • Renew book • Reserve book • Privileged services for the Library Assistants • Issue and renew book to a borrower • Return a book by a borrower • Validate new registration • Validate renew of membership • Delete a membership Information System Design IT60105, Autumn 2007

  6. Case Study: Library Information System • Problem Description • Functional point of view: • Privileged service for the Library Manager • Enter a New book • Remove a book • Billing System • Get membership fee • Get renewal fee • Get fine/recovery charge • Payment to a supplier • Status of books • Total number of books in the text book section • Total number of books in the reference section • Number of books lost etc. Information System Design IT60105, Autumn 2007

  7. Case Study: Library Information System • Problem Description • Functional point of view: • Privileged services for the Library Manager • Miscellaneous queries • Total number of books for a given subject • How many books for a given title? • How many books for a given author? • Total deposit on membership • Total earn on fine/recovery • Privileged services for the Suppliers • Books on demand • Authorization request • Response to quotation • Submit bill • Get payment etc. Information System Design IT60105, Autumn 2007

  8. Case Study: Library Information System • Problem Description • Information point of view: • List of books • List of borrowers • List of library personnel and their authorizations • List of all suppliers and supplies Information System Design IT60105, Autumn 2007

  9. Function-Oriented Design Information System Design IT60105, Autumn 2007

  10. Function-Oriented Design of LISStructural View Information System Design IT60105, Autumn 2007

  11. Function-Oriented Design of LISStructural View (cont’d) Information System Design IT60105, Autumn 2007

  12. Function-Oriented Design of LISStructural View (cont’d) Information System Design IT60105, Autumn 2007

  13. Function-Oriented Design of LISSystem View (cont’d) Points to be noted • Data is centralized • Several functions are there to manipulate centralized data • Functions are grouped together to form high level functions Information System Design IT60105, Autumn 2007

  14. Object-Oriented Design Information System Design IT60105, Autumn 2007

  15. Object-Oriented Design of LISStructural View Information System Design IT60105, Autumn 2007

  16. Object-Oriented Design of LISStructural View (cont’d) Information System Design IT60105, Autumn 2007

  17. Object-Oriented Design of LIS • System is designed by designing objects • Objects are abstractions of real-world or system entities and manage themselves • Each object has attributes, operations • Information is not represented as a centralized store • Data and operations are grouped together Information System Design IT60105, Autumn 2007

  18. Problems to Ponder • How an object can be created? • What happen when an object is destroyed? • What is the basic principle of decomposing an object? • How the decompose objects are integrated? • Compare function-oriented approach and object-oriented approach • Decide parameters for comparison Information System Design IT60105, Autumn 2007

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