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Chapter 1.pdf

  1. 1. CHAPTER 1 INTRODUCTION TO HUMAN COMPUTER INTERACTION SLIDES PREPARED BY Ts. DR. KOHILAH MIUNDY
  2. 2. DEFINITION OF HUMAN COMPUTER INTERACTION • Interaction between user and computer OR relationship between users and computer systems
  3. 3. THREE (3) FUNDAMENTAL COMPONENTS OF HCI 1. Human User • People are diverse, unpredictable messy, ill-understood. They have different abilities. 2. Computer system • Devices are much more complicated and multi-functional then before 3. Interactive process • Dialogue between human and computer. The interface between humans and the computer they use is crucial to facilitating this interaction
  4. 4. HCI GOALS • The goal of HCI is to improve the interaction between users and computers by making computers more user-friendly and receptive to the user’s needs. • Improving the usability is the key factor • To design systems that minimize the barrier between the human’s cognitive model of what they want to accomplish and the computer’s understanding of the user’s task
  5. 5. HCI AND USER INTERFACE DESIGN • HCI was largely about user interface design. • The earliest innovation in HCI were the creation of things like the light pen, the first computer mouse which allow for flexible interaction with things on screen but the focus was squarely on the screen. • So we, developed many principles about how to design things nicely.
  6. 6. USER INTERFACE • User Interface mediate the interaction (dialog) between human and computer. • The user interface today is often on of the most critical factors regarding the success or failure of a computer system.
  7. 7. IMPORTANCE OF USER INTERFACE DESIGN • The only contact medium that the user has with the system. • The interface is the system designer’s way of representing the system to the user known as conceptual model. • If the system has the confused interface – user may choose not to use the system at all OR will use it incorrectly. • A well-designed interface can increase productivity
  8. 8. GOOD USER DESIGN • Increase efficiency • Improves productivity • Reduces errors • Reduces training • Improves acceptance
  9. 9. GOOD USER DESIGN 1. USEFUL • accomplish what is required • functional, does things 2. USABLE • easy to do things, does the right things, enjoyable, user experience 3. USED • make people want to use it • attractive, available, acceptable to organisation
  10. 10. COMPUTER TECHNOLOGY INFLUENCES THE NATURE OF INTERACTION AND STYLES 1. Input / output devices for interactives users 2. Virtual reality systems and 3D visualization 3. Physical devices 4. Memory capacity 5. Processing speed
  11. 11. INPUT / OUTPUT DEVICES FOR INTERACTIVE USERS • Input devices - send information to a computer system for processing • Output devices – reproduces or displays the results of that processing • Most devices are only input devices or output devices as they can only accept data input from a user or output data generated by a computer. Inputs • Keyboard • Microphone • Mouse • Motion sensor • Heat sensor • Digital camera • Touch / Graphics Pad • Bar code reader Outputs • Display • Speakers • Printer • Projector
  12. 12. INPUT / OUTPUT DEVICES FOR INTERACTIVE USERS • Some devices can accept input and display output and they are referred to as I/O devices.
  13. 13. COMMON INTERACTION STYLES • Command line interface • Menus • Natural language • WIMP interface (Windows, icon, menus and pointers) • Question / answer and query dialogue • Form-fills and spreadsheet • Point and click interface • Three-dimensional (3D) interfaces • Web navigation
  14. 14. MENUS • Menu interface: commands organized into logical groups (more intuitive than command) • A submenu can be used to present further related list of sub-functions or options • Menu structure limits range of options (less expressive than command entry) • Restricted form if WIMP
  15. 15. FORM INTERFACE • Form Interface: presents specific questions to which user must respond in order to perform some task. • Intuitive, since users are led step by step through interaction • Not expensive, since form allows to only a few specialized commands
  16. 16. WIMP • WIMP stands for Windows, Icons, Menus, Pointers • WIMP interfaces are familiar as they are the basis of most desktop computer operating systems

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