A big thank you to everyone who has given me feedback on "What makes a powerful question?" Your comments have been tremendously helpful in provoking my thoughts on the subject.
You can see the comments/discussion on the Gurteen Knowledge Community group on Linkedin.
I am still looking for input from anyone who would like to add further to the discussion.
But note, I realize now that I was not entirely clear in my question :-)
Rather than ask "What makes a powerful question?", I meant to ask "In triggering a conversation to explore an issue - what makes a powerful question?"
How would one design or wordsmith such a question? What are its attributes?