Interface Guidelines

1
Interface Guidelines Principles

• Responsiveness

2
Interface Guidelines Principles

• 7 principles for Interface Design
• Focus on the users tasks, not technology.
• Conform to the Users View of the Task.
• Consider function first, presentation later.
• Promote Learning
• Deliver Information
• Responsiveness

3
Responsiveness

• The softwares ability to keep up with users and
  not make them wait.

4
Responsiveness

• 2 types of speed
• Real or Machine versus Perceived Speed
• Real/Machine Speed
• The speed at which the computer operates.
• Perceived Speed
• The speed at which the user perceives the
  computer operates.
• This is the most important speed.

5
Perceived Speed

• Assume you are displaying a 3D image.
• Real Speed
• You show an hour glass.
• When the image completely renders, display the
  image.
• Perceived Speed
• You show the image as it is rendering.
• Perceived Speed is more pleasing to the user.

6
Responsiveness

• Improving the responsiveness (speed) of software.
• Increases user satisfaction.
• Increases productivity.

7
Responsive Software Should

• Provide enough feedback for users to see what
  they are doing.
• Let users know when it is busy.
• Give the user a gauge on how much time operations
  will require.
• Allows the users to work at their own pace.
• Increases productivity.

8
Responsiveness

• Responsiveness is NOT the same as performance.
• Slow software can have a good response time.
• Computation is always faster than communication.
• The computers speed (in most cases) is faster
  than the users ability to communicate.
• All delays are not created equal.
• Different delays require different responses.

9
Reasons for Poor Responsiveness

• Designers rarely consider responsiveness during
  design.
• Programmers equate responsiveness to performance.
• Developers use simple naïve, implementations.
• UI tools are inadequate to support
  responsiveness.
• SQL Query Processing.
• Managers hire people with the wrong skills.

10
What are some responsiveness bloopers?
Give me 5 examples of responsiveness bloopers.