1. USER
INTERFACE

2. What is the User Interface?
The user interface (or Human Computer Interface) is the aggregate of means by which people (the users) interact with the system (a particular machine), device, computer program or other complex tools.

3. The user interface provides:
Input which allows the users’ to manipulate a system
Output which allows the system to produce the effects of the users' manipulation.

4. Types of User Interfaces
Command driven
Menu driven interface
Pull Down Menu
Pop-up Menu
Icons
Touch Screen
Anti-glare Screen

5. Command driven
The command driven interface requires the user to type commands using keywords that tells the operating system what to do e.g. format or copy.
Give an example of a software that is command driven?

6. Example
Copying a file from directory.

7. Menu driven interface
Term used to describe a software program that is operated using file menus (menu.htm) instead of using commands. Menu driven interface allows the user the freedom of manipulating the system without having to memorise the different commands.

8. Menu-driven interface Cont’d
Menu-driven interface is commonly easier for most users as it is a graphical environment and allows the user to navigate using the mouse.
Give an example of a software that uses menu-driven interface?

9. Example of Menu Interface
Example of web menu driven interface

10. Pull Down Menu
Also called a drop-down menu that appears when you select an item with a mouse. The item you select is generally at the top of the display screen, and the menu appears just below it, as if you had pulled it down.

11. Example of Pull Down Menu
Formatting a word document

12. Pop-up Menu
A group of options or selections offered to a user that appears as a result of pressing a special function key, clicking a button with the mouse. Pop-up menus are used to display a list of articles for each section of a site that can help your Web visitors by saving them time and effort in their search for useful information.

13. Example of Pop-up Menu ,.

14. What is an icon?
An icon is a graphic image, a small picture or object that represents a file, program, web page, or command. Icons help you execute commands, open programs or documents quickly. To execute a command by using an icon, click or double-click on the icon. Give an example of an icon

15. Example of an Icon
Icons shown on an IPhone

16. Touch Screen
A touch screen is a display which can detect the presence and location of a touch within the display area. The term generally refers to touch or contact to the display of the device by a finger or hand.

17. Example of Touch Screen

18. Anti-glare Screen What is an anti-glare screen?
What is the main purpose of the anti-glare screen?

19. Anti-glare Screen
This is a monitor screen that is treated to reduce glare from light sources.
It is a polarized screen attached to the front of the monitor which reduces eye strain

20. Example of Anti-glare screen
Computer and anti-glare screen

21. Class Activity
What are the advantages and disadvantages of menu driven interface over command driven interface?
Give one example of an operating system that uses a command driven interface

22. Class Discussion
What would be the impact on our society if we were still using the command driven interface on our operating systems? Discuss.