The one standard that I use is to start the description with the Class name and Object name, and follow that by a brief business definition when possible. In the query panel (at least in DeskI) you can’t tell the class name for result / condition objects. Because the description can be displayed at the bottom of the query panel, having the class name and object name as the standard is very helpful.
And FYI, you may find this utility useful in helping maintain descriptions … Mass update to object names / descriptions
Dwayne Hoffpauir 
(BOB member since 2002-09-19)