The user interface design process involves understanding users and business needs, principles of screen design, and selecting appropriate controls. Key steps include developing navigation, selecting windows and controls, writing clear text, providing feedback, testing, and considering users, tasks, environments, and hardware when choosing controls. Common input devices include mouse, keyboard, touchscreen, graphics tablet, joystick, light pen, and voice recognition. Controls are direct or indirect based on their relationship to screen interaction.

1. USER INTERFACE DESIGN PROCESS
• KYOW YOUR USER DCLIENTs
• UNDERSTAND THE BUSINESS FUNCTIONS
• UNDERSTAND THE PRINCIPLES OF GOOD SCREEN
DESIGN
• DEVELOP SYSTEM MENUS AND NAVIGATION
SCHEMES
• SELECT THE PROPER KINDS OF WINDOWS
• SELECT THE PROPER DEVICE BASED CONTROLS

2. CONTD..
• WRITE CLEAR TEXT AND MESSAGES
• PROVIDE EFFECTIVE FEEDBACK AND
GUIDANCE AND ASSISTANCE
• PROVIDE EFFECTIVE INTERNALIZATION AND
ACCESSIBILITY
• CREATE MEANINGFUL GRAPHICS,ICONS AND
IMAGES
• CHOOSE THE PROPER COLURS

3. CONTD..
• ORGANIZE AND LAYOUT WINDOWS AND
PAGES
• TEST ,TEST AND RETEST

4. DEVICE BASED CONTROLS
• Input Devices: Through which people
communicate to system.
TRACKBALL
JOYSTICK
GRAPHICS TABLET
LIGHT PEN
TOUCH SCREEN
VOICE
MOUSE
KEYBOARD

5. TYPES OF DEVICE CONTROLL
• Operated on the screen itself-DIRECT DEVICES
Eg:light pen, touch screen
• Other than the screen :INDIRECT DEVICES
Eg:Mouse,Keyboard

6. USE OF DEVICE BAESD CONTROL
• To point an object on the screen
• To select an object
• To drag
• To track or follow a moving object
• To position an object
• To enter or manipulate information

7. TRACKBALL
• A spherical object(ball) that rotates freely
• Direction and speed is translated in to cursor
movement
• Well suited for video games or 3D
Environments

9. CONTD..
• ADVANTAGES
Direct relationship between hand and pointer in
terms of direction and speed
Does not require additional desk space
• DISADVANTAGES
5 finger movement is needed
indirect control
difficult to control
requires a degree of eye hand coordination

10. JOYSTICK

11. CONTD..
• Stick /bat shaped device in variable sizes
• It responds by exerting pressure on them
• Some permits continuous movement, some
others support vertical & horizontal
movement
• Direct relation between pointer and hand in
terms of direction.
• Indirect relation between hand and pointer in
terms of speed and distance

12. GRAPHIC TABLET
• Sensitive horizontal surfaces .
• We can operated with fingers ,light pen,
object like stylus
• Requires additional desk space
• Direct relationship in terms of speed ,distance
and direction

13. TOUCH SCREEN..
• Screen which is sensitive to finger or stylus
• Direct relationship in terms of speed ,distance
and direction
• Does not require additional desk space
• May damage the screen

14. LIGHT PEN
• Screen can be controlled by a pen or stylus
• Direct relationship in terms of speed ,distance
and direction
• More accurate than finger touching.

15. VOICE
• Automatic speech recognition by the
computer
• Useful when people does not use keyboard
• Simple and direct
• Difficult to use in noisy environment
• High error rates

16. MOUSE
• A rectangular or dome shaped movable device
containing one to three buttons used to
manipulate objects on the screen
• Direct relationship in terms of speed ,distance
and direction
• Requires additional desk space

17. KEYBOARD
• Standard typewriter keyboard and cursor
movement keys
• No direct relation ship between finger
movement on the keyboard and cursor
movement on the screen
• Keyboard accelerators: way to access menu
elements without displaying a menu

18. How to select one?????
• Factors
 Task
 User
 Environment
 Hardware
 The device in relation to application
 Minimizing eye and hand movements

19. CONTD..
• Pointer Guidelines
 Should be visible all times
 Shape should clearly indicate the purpose of movement
 Should maintain fixed size
 Do not create new shapes for already defined standard
functions
 User should always position the pointer