Your SlideShare is downloading. ×
0
analysis and design of information system
analysis and design of information system
analysis and design of information system
analysis and design of information system
analysis and design of information system
analysis and design of information system
analysis and design of information system
analysis and design of information system
analysis and design of information system
analysis and design of information system
analysis and design of information system
analysis and design of information system
analysis and design of information system
analysis and design of information system
analysis and design of information system
analysis and design of information system
analysis and design of information system
analysis and design of information system
analysis and design of information system
analysis and design of information system
analysis and design of information system
analysis and design of information system
analysis and design of information system
analysis and design of information system
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

analysis and design of information system

6,954

Published on

Published in: Education
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
6,954
On Slideshare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
213
Comments
0
Likes
1
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. Analysis and design of information system
  • 2. introduction
    Information Systems Analysis and Design
    Complex organizational process whereby computer-based information systems are developed and maintained
  • 3. System development life cycle
    Traditional methodology for developing, maintaining, and replacing information systems
    Phases in SDLC:
    Planning
    Analysis
    Design
    Implementation
    Maintenance
  • 4. The system development life cycle
  • 5. The planning phase
    Identify, analyze, prioritize, and arrange IS needs
  • 6. introduction
    ANALYSIS
    Analysis as ‘the breaking up of any whole so as to find out their nature, function etc.
    Analysis gives the conceptual understanding of a system from the logical point of view by detailing its functionality.
  • 7. Study and structure system requirements
  • 8. design
    Design as ’to make preliminary sketches of; to sketch a pattern or outline for; to plan and carry out especially by artistic arrangement or in a skilful way.’
    Designing gives us the blueprint on the basis of which the actual system is developed
  • 9. Analysis concepts and principles
    Requirement analysis
    Requirement analysis is a formal process of interacting with a client to understand and then put in a formal document the requirement of the client.
    While initiating the process of requirement elicitation and analysis, some key issues must be understood so that analysis is easier, they are:
    The key people driving the request. This will help them to focus their information gathering activity.
  • 10. Conti….
    The key people who will use the system.
    The financial benefit.
    What accounting to user is a good solution?
    What is the problem that system will address?
  • 11. Analysis Principles
    The domain of information in which the problem operates has to be appreciated.
    The key functions of the system have to be defined.
    System must be modular. This is required to help create the system in a faster way.
    System has to be defined in abstract term. This helps reduce complexity.
    The ambiguity in the system must be reduced to enable designer to focus on the outcome clearly.
  • 12. System requirement specification
    Information description : where the detailed information description is given.
    Functional description : where the functionality required from the system is given.
    Validation description : this is the data validation and business rule description required in the system.
  • 13. Design principle
    It should have an overall macro view of the system rather than a tunnel view
    The design process should be logical.
    The design should reinvent the wheel.
    The design should be a very close abstraction of the problem.
    The design should be uniform and integrated
    The design should be structured
    The design should be reviewed on a real-time basis to minimize errors.
  • 14. Design concept
    Abstraction
    Procedural abstraction
    Data abstraction
    Control abstraction
    Refinement
    Modularity
  • 15. abstraction
    Abstraction is the conceptualization of an issue or problem or entity in terms of some level of generalization without regarding to irrelevant low-level details.
    Procedural abstraction : it is a named collection of several sequential procedural steps.
    Data abstraction : this is name of a set of data that defines of an object.
    Control abstraction : this is a named control mechanism, which has several steps.
  • 16. refinement
    Refinement helps the designer in elaborating the system and bringing-out lower-level details as the design progress.
    This is a top- down design strategy in which design is refined after each successive step.
  • 17. modularity
    It helps the designer to compartmentalize the design into functional compartments as the entire system can be conceived to be composed of a set of modules, each having its own special feature and functionality rather than a monolithic entity.
    Modularity helps the designer to comprehend the system better.
    Effective modular design in general reduces the complexity of the system by dividing system into easily understandable modules.
  • 18. Tool for design
    Data flow diagram(DFD)
    Data dictionary(DD)
  • 19. Data flow diagram(DFD)
    • The data flow diagram is a powerful tool to understand the functional and information view of system.
    • 20. It can be two types – Logical data flow diagram and Physical data flow diagram
    Logical data flow diagram deals with the functional views of the system.
  • 21.  Entity is represented.
    Curve like represents information flow from one entity (or) process (or) data store to another
    Two parallel lines represent data store.
    a process is represented by a circle.
  • 22. SDLC Design Phase
    Logical design: functional features described independently of computer platform
    Convert recommended solution to system specifications
    Physical design: logical specifications transformed to technology-specific details
  • 23. Data dictionary(DD)
    • The data dictionary is a complete and comprehensive definition of all the data element in the system.
    • 24. It is the source document for specifications of all inputs, protocols, outputs, data structures, database structures, meta data and algorithm.
  • Cont………..
    • A DD normally serves the following purpose:
    A summary of the documentation
    A tool to reduce redundant data
    A background for I/O design
    As a centralized control of all data in a system
    As a controller of data integrity.
  • 25. Thank you friends……..

×