It's supplemented with good examples.
The points:
- The user is not using your application
- Fitt's Law
- Unnecessary interference
- Use the power of the computer
- Make items easy to distinguish and find
The most basic point in all computer UI design is that the user does not want to use your application. They want to get their work done as quickly and easily as possible, and the application is simply a tool aiding that.
This is the most basic and well known of UI design laws. It states that the larger and nearer to the mouse pointer an on-screen object is, the easier it is to click on. That's common sense, yet it is often completely ignored in UI design.
When a user is working, their attention is on the work they are doing. Every time they have to move their attention away from their work to the application, it takes time for them to get back to where they were in their work. Therefore, you should minimise the amount of distraction and interference your application gives the user. Every application has an item that is its key focus ? in a text editor, it's the text; in a web browser, it's the web page ? so make that central to your interface.
Computers are powerful things these days, with billions of processor cycles per second and hundreds of gigabytes of storage available. Humans, however, haven't changed that much in hundreds of years. We still get tired, bored or distracted and have a limited amount of mental energy available at any one time. It would seem a good idea, therefore, to shift as much work as possible off the poor, worn out human and on to the untiring, super fast computer in front of them.
This point is pretty simple: items on the screen that do different things should be easy to see and differentiate from each other.
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