FTA:

“Minimize Taps

Most information about that data should be accessible in a minimal number of taps of the stylus — one or two.

Desktop user interfaces are typically designed to display commands as if they were used equally. In reality, some commands are used very frequently while most are used only rarely. Similarly, some settings are more likely to be used than others. On Palm Powered handhelds, more frequently used commands and settings should be easier to find and faster to execute.

• Frequently executed software commands should be accessible by one tap.

• Infrequently used or dangerous commands may require more user action.”