This principle applies in a variety of situations. When items in a list need to be reordered, a user may want them ordered alphabetically, but he may also want them in order of personal preference; something no algorithm can offer.

• 这个原则被应用于多种情况下，当一个清单需要重新排列时，用户也许想按照字母表顺序排列，也有可能希望按照和个人的关系排列。