from: http://www.userfocus.co.uk/articles/usermanuals.html

These guidelines are based on:

Best practice principles.
Principles of good information design.
Aspects of human perception, cognition and psychology as it pertains to reading.
Our own experience of user testing various kinds of user manuals and documentation and seeing what works and what doesn't.
We have arranged the tips into the following sections:

General guidelines
How to create a great first impression
How to enh