Screen Shots in Documentation
http://user-assistance.blogspot.com/2009/10/screen-shots-in-documentation.html

Hughes, Michael A.
User Assistance
2009

Abstract:

Just as I would with words, I'll cut out the obvious and whatever does not add value. I prefer an additive approach (put it in only when the words seem inadequate) over a subtractive approach (take it out if it seems superfluous). In other words, I'll be more open to screen shots in the future, but they have to work themselves into the document, not just be their by entitlement until expelled.