JESS: observing partial activation of rules

[Skeptic 2000]

 
Hi,
I'm curious how this : 
http://ctat.pact.cs.cmu.edu/docs/ctat_2_1/cog_tutor_jess_tools.html#why_not can 
be achieved.It is something that require a modification of Jess ? I don't see 
how to find that information using the public API.
 
Thanks for help.
 
 
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