User's Manual

www.openmoko.com
12
2-1-1 General Principles
All modifications are saved instantenously, there should never be a save
command.
Make sure users can't make interface operation errors, or that the effects
are easily reversible, instead of just notifying them of the potential
consequences of their actions.
When you open a document you should be returned to the place where you
were working when you last closed or save it (this is our concept of
sessions).
Label buttons with adjectives, which describe the state of the object
affected
Designers should seek an efficient monotonous solution to gain benefits,
including ease of learning, simplicity of implementation, minimization of
documentation, and lowered maintenance costs.
Whenever you find yourself specifying an error message, please stop; then
redesign the interface so that the condition that generated the error
message doesn't arise.
If the user gets no utility from a process, there is no reason to tell them
that it is happening.
Provide unlimited levels of Undo and Redo whenever possible.
Consider adding a Trash or Deleted Items area that has everything the
user has deleted. The user’s data is the most important priority. Let’s
make it hard for them to lose anything and easy to recover it.