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Systems Analysis and Design

What is User Interface?
 the aggregate of means by which people—the users—interact with the system  provides means of input and output—the system itself  aspects:   

Physically Perceptually Conceptually

Designing the User Interface

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Systems Analysis and Design

Guidelines for Designing User Interface
 Strive for consistency.  Enable frequent users to use shortcuts.  Offer informative feedback.

 Design dialogs to yield closure.
 Offer simple error handling.  Permit easy reversal of actions.  Support internal locus of control.  Reduce short-term memory load.

Designing the User Interface

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Systems Analysis and Design

Systems Analysis and Design

What is User Interface?
 Objectives in designing user interface:
    

Types of User Interface
 Natural-Language Interface


Match the user interface to the task. Make the user interface efficient. Provide appropriate feedback to users. Generate usable queries. Improve productivity of knowledge workers.





permits users to interact with the computer in their everyday or natural language no special skills required of the user who interacts with the computer used by some Web sites

 Question-and-Answer Interface


 Two main components:
 

Presentation language Action language



 

the computer displays a question to the user on the display the user enters an answer (via keyboard stroke or mouse click), and the computer acts on that input information dialog box is a type of this interface examples include use of wizard and Office Assistant in MS applications

Designing the User Interface

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Designing the User Interface

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Systems Analysis and Design

Types of User Interface
 Menu Interface


 







provides the user with an onscreen list of available selections users are limited to the options displayed users need to know what task should be accomplished users should know which task they desire to perform when utilized can be set up to use keyboard entry, lightpen, or mouse consistency in design

Menus (drop-down menu) from Microsoft Word
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Systems Analysis and Design

Types of User Interface
 Form-Fill Interface
 

input/output forms consists of onscreen forms or Web-based forms displaying fields containing data items...
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