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Information processing and user interfaces
User Interfaces
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What is an interface?
• What we use to interact
• With people
– Language
2
What is an interface?
• What we use to interact
• With computers
– Mouse
– Screen
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Command Line interface
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• What do we see on the screen?
• In the early days, we saw this
Problems with command interfaces
• Users have to learn and remember a command language.
• So unsuitable for occasional users
• Users make errors in command. An error detection and recovery system is required
• System interaction is through a keyboard so typing ability is required
Graphical User Interface(GUI)
On the screen applications display a GUI such that the user can work with it
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Option buttons
Cancel/OK Command buttons
Checkbox
Dialog or Text box
Printer Selection
Graphical, explicative icons
Hardware interface
• What computers use to communicate
• With other computers
– Modem
– Router
– Hubs
– Switch
– Wires
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Interfaces of Web-Based Applications: hyperlinks
• Users move to different webpages by clicking on hyperlinks
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