when in negotiations with a business partner,What did the person [or persons] with whom you were negotiating

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Question:

when in negotiations with a business partner,What did the person [or persons] with whom you were negotiating do that was
effective and why did it work?
What did the other person do that was not effective and why was it not
successful?
What did you do what was effective and why did it work? as far as working together
What did you do that was not effective and why was it not successful?
What surprised you during the negotiation, why it surprised you, and how did you react?