Brevity versus usability
IBM DeveloperWorks: The user interface is the primary channel of communication between software and users, and is basically textual in nature, so clear language is critical to usability. Unfortunately, this clarity is often sacrificed in an effort make messages unnecessarily brief. If you use language a bit more generously, often just by adding a well-chosen word or two, confusing or ambiguous messages can easily be made understandable. (2001-07-01)
The link address is: http://www-106.ibm.com/developerworks/usability/library/us-brevity.html