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CBT is its own world, with many many many sources of information and
standards. One place to start is the website for CBT Solutions magazine
(www.cbtsolutions.com). There are a number of textbooks and guidebooks as
well.
What are you trying to do? Train users to work the application? In that
case, you need to simulate the main activities they will do. No other
solution is worthwhile - it would just duplicate the online help.
I've got twenty years' experience in CBT, including lots of software
training stuff, and have yet to find the perfect textbook or set of studies.
But CBT Solutions is a good place to start. And don't do CBT without an
instructional designer or CBT specialist available.