Thanks for the kind words - I like to be "astute", even though I am not always that.

My impression of MAJ Moran's 8-pager is the same as yours. Your summary of "knowledge" and "use" hits it on the head:

Dividing and defining language used in the conduct of interrogation into “knowledge” and “use” is an important point for interrogators to consider, even when working in their native language, but obviously more so when working in a second language. Regarding “knowledge” of language, the author stresses the importance of idiomatic language, as opposed to technical vocabulary, for rapidly developing rapport and initiating conversation with the source. (Oreste Pinto is another WWII interrogator who has written useful material on the understanding of language in interrogation) As for “use” of language, the author discusses in a simple and general manner concepts of rapport, cognition, questioning methodology and leveraging aspects of culture in questioning. He also describes the difference between empathy and sympathy, and the dangers of the latter, although not in such precise terms.
In my world, your concepts run throughout client conferences (non-adversarial), witness interviews (which may be adversarial or not) and formal depositions (adversarial, if an adverse party or witness). I might sound very impressive in using "technical vocabulary" (whether legal or scientific), but I will miss the boat by doing that. The trick is to translate the technical vocabulary into idiomatic language.[*]

My impression of Chip Morgan's manual is that it parallels MAJ Moran's memo in many respects (being non-adversarial in the interviewee's eyes; not being a bulldozer; empathy vs sympathy, etc.). It is more bullet-point than academic in style.

Similar concepts also apply to witness preparation, direct examination and cross examination at trial; but they require other, overriding concepts as well. Each is a specialized area of practical trial work, but getting information from discovery and interviews underlies all of that.

So, 95% of it is preparation and perspiration; only 5% is the flashy stuff at trial. And, if you follow the Columbo model (as I do), the trial stuff is not all that flashy.

Regards

Mike

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[*] Whatever the subject matter area, it is important for me to become something of a subject matter expert in that area - albeit with a limited focus. For example, if you have a forklift accident at a loading dock, you have to learn all you can about loading operations at that particular dock (and maybe some other docks as well).