Apple Computer Network Router 2 User Manual download pdf (Page 32)

CHAPTER 1

Newton and Its Users

1-8 Observe Basic Human Interface Principles

You can make your application consistent visually and behaviorally by

incorporating standard Newton interface elements in it. Visual consistency

helps people learn and then easily recognize the graphic language of the

interface. For example, users learn to recognize a black diamond as the

source of a pop-up list of choices. Behavioral consistency of the interface

means people only have to learn once how to do things such as erasing and

scrolling. Then they can explore new functions and applications using the

skills they already have.

User Control 1

Allow users, not your application, to initiate and control actions. Keep

actions simple and straightforward so users can easily understand and

remember them. Provide ample opportunity to cancel operations before they

begin, and wherever possible allow users to gracefully stop an operation

that’s underway. Be careful about unleashing agents, experts, or wizards that

will do things behind a user’s back.

Forgiveness 1

People make mistakes, so your program should make it easy for them to

correct their mistakes. Let them use the Undo button to reverse their last

action. People need to feel they can experiment without damaging the

system or their data. Create safety nets for people so they feel comfortable

learning and using your product.

Always advise people when they begin an operation that has potentially

dire consequences. Display a warning and have the user conﬁrm the operation

before proceeding. This doesn’t mean you should have users conﬁrm every

action. Frequent warning messages suggest something is wrong with

the program design—obviate some of the warnings by making more

actions reversible.

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Apple Computer Network Router 2 User Manual Page 32