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Designing and Evaluating DSS User Interfaces. Why is the user interface the most important component of a DSS?. User Interface: An Overview. A set of menus, icons, commands, graphics Hardware and software Provides cues for desired actions by the user. A User Interface puzzle.

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Designing and evaluating dss user interfaces l.jpg

Designing and Evaluating DSS User Interfaces

Why is the user interface the most important component of a DSS?


User interface an overview l.jpg
User Interface: An Overview

  • A set of menus, icons, commands, graphics

  • Hardware and software

  • Provides cues for desired actions by the user

A User Interface

puzzle

Designing and Evaluating DSS User Interfaces, D. J. Power


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User Interface: An Overview

  • A well-designed user interface can:

    • Increase human processing speed

    • Reduce errors

    • Increase productivity

    • Create a sense of user control

Designing and Evaluating DSS User Interfaces, D. J. Power


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Issues Related to Building an Interface

  • User interface style

    • Is the style or combination of styles appropriate? What styles are used in the user interface?

  • Screen design and layout

    • Is the design easy to understand and attractive? Is the design symmetric and balanced?


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Issues Related to Building an Interface

  • The human-software interaction sequence

    • Is the interaction developed by the software logical and intuitive? Do people respond predictably to the interaction sequence?

  • Use of colors, lines and graphics

    • Are colors used appropriately? Do graphics improve the design or distract the user?


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Issues Related to Building an Interface

  • Information density

    • Is too much information presented on a screen? Can users control the information density?

  • Use of icons and symbols

    • Are icons understandable?

  • Choice of input and output devices

    • Do the devices fit the task?


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User Interface Input Styles

  • Command-line Interfaces

  • Menu Interfaces

  • Graphical User Interfaces

  • Question and Answer Interfaces

  • Voice, touch, immersive

  • Most DSS use a combination of styles

Building Blocks

Designing and Evaluating DSS User Interfaces, D. J. Power


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Command-Line

a method of interacting with a computer via a text terminal. Commands are entered as typed characters from a keyboard and output is also received as text. The > carat is the command prompt.

>RUN Analyzer

>LOAD sales.dat

>DISPLAY CHART

Designing and Evaluating DSS User Interfaces, D. J. Power


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Menu

a list of entries for the user to choose from

Designing and Evaluating DSS User Interfaces, D. J. Power


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Graphical User Interface

A graphical user interface or GUI (pronounced "gooey")

use a mouse pointer to act on objects

Designing and Evaluating DSS User Interfaces, D. J. Power


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Question and Answer

A type of dialogue in which a computer displays questions, one at a time, for a user to answer.

Designing and Evaluating DSS User Interfaces, D. J. Power


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Voice, touch, immersive

  • Voice Command Language

  • Natural language

  • Immersive 3D User Interface

  • A CAVE with four sides (three walls and a floor) is used as a display and interaction space.

Designing and Evaluating DSS User Interfaces, D. J. Power


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ROMC Design Approach

  • Representations

  • Operations

  • Memory Aids

  • Control Aids

Designing and Evaluating DSS User Interfaces, D. J. Power


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Innovative Representations

Designing and Evaluating DSS User Interfaces, D. J. Power


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Operations

  • Operations are specific tasks that a decision-maker can perform with a DSS

  • For example, a DSS may have operators to gather data, generate a report, retrieve alternatives, rate alternatives, add alternatives, etc.

  • Analysts need to decide how operations will be controlled from the user interface. Will menus be used? Icons?


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Memory Aids

  • Support the use of representations and operations

  • Example: icon tips


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Control Aids

  • DSS control aids are intended to help decision-makers use representations, operations and memory aids

  • Control aids help decision-makers direct the use of the DSS

  • Generic control aids

    • Save, edit, undo, and delete


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Building the DSS User Interface

  • Get started - identify the user, brainstorm capabilities

  • Design screens and respond quickly to feedback

  • Pay attention to the interaction -- try it, analyze it, simplify it, change it, try it ...

Designing and Evaluating DSS User Interfaces, D. J. Power


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Design Elements

  • Graphics are useful - communicate one main idea

  • Color enhances the interface

  • Symmetry -- balanced proportions, beauty of form

  • Provide guidance to users

Designing and Evaluating DSS User Interfaces, D. J. Power


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Guidelines

  • Strive for consistency

  • Provide informative feedback

  • Design dialogs to create closure

  • Permit easy reversal of actions

  • Reduce information overload

Designing and Evaluating DSS User Interfaces, D. J. Power


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Factors influencing design success

  • DSS speed

  • Versatility of DSS -- multiple tasks

  • Quality of on-line help

  • Adaptability of the DSS

  • Uniformity of interface

  • Learning time

  • Ease of recall

  • Fun

The design of user interface software is not only expensive and time-consuming, but it is also critical for effective system performance.

Designing and Evaluating DSS User Interfaces, D. J. Power


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