Even better than acting in haste and forcing users to rescue the program with Undo, you can make sure that applications offer users adequate information so that they never issue a command (or omit a command) that leads to an undesirable result.

• 比草率行动迫使用户使用撤销来挽救程序更好的方法是你可以确保程序为用户提供了足够的消息，使其不会故意发起导致不恰当操作的命令（或者从来不忽略一个必要的命令）。