Analysis And Design Of Information System

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					        Analysis and Design of Information
                     Systems




Prepared By: Er Gaurav Sharma
     Categories of information systems
    • Transaction Processing Systems
    • Management Information Systems
    • Decision support system




Prepared By: Er Gaurav Sharma
        Transaction Processing System
  • A transaction is an event or activity that affects the
    organization.
  • Placing orders, billing customers, hiring employees, and
    depositing checks.
  • Transaction processing, the set of procedures for
    handling the transactions, often includes these
    activities:
   Calculation
   Storage and retrieval
   Classification
   Summarization
   sorting
Prepared By: Er Gaurav Sharma
    Management Information Systems
  • Decision making and Problem solving
  • Can draw on data stored as a result of
    transaction processing, but may also use other
    information.
  • Information systems specialists frequently
    describe the supported by these systems as
    structured decisions.
  • Well structured reports by system analysts.

Prepared By: Er Gaurav Sharma
             Decision Support Systems
  • Decision support systems (DSS) assist managers
    who must make decisions that are not highly
    structured, often called unstructured or semi-
    structured decisions.
  • No clear procedures for making the decisions
    and not all the factors can be determined in
    advance.
  • Information is not sufficient
  • Manager judgment plays a vital role.

Prepared By: Er Gaurav Sharma
        System Development Strategies
    • Classical Systems Development Life Cycle
    • Structured Analysis Development method
    • System Prototype Method




Prepared By: Er Gaurav Sharma
        Classical System Development Life
                   Cycle Method
    •   Preliminary investigation
    •   Requirement Determination
    •   System Design
    •   Software Development
    •   Systems Testing
    •   Implementation and evaluation



Prepared By: Er Gaurav Sharma
        Structured Analysis Development
                    Method
  • Structured analysis focuses on specifying what
    the system or application is required to do.
  • Elements of structured analysis: Graphic
    description, Data Flow Diagrams, Data
    Dictionary.
  • Structured Design




Prepared By: Er Gaurav Sharma
            Systems Prototype Method
  • Prototype is a working model not an idea. It is
    the first version or iteration of an information
    system- an original model.
  • Reasons for systems prototyping are as:
  No system with one proposal.
  Essential features are partially known.
  With experience new requirements will come
    in existence.


Prepared By: Er Gaurav Sharma
          Steps in prototyping process:
  • Identify the user’s known requirements.
  • Develop a working prototype.
  • Use the prototype, noting needed
    enhancements and changes.
  • Revise the prototype based on information
    gained through user experience.
  • Repeat these steps as needed to achieve a
    satisfactory system.

Prepared By: Er Gaurav Sharma
                                THANKS




Prepared By: Er Gaurav Sharma