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1- keep all your ideas in question formats to get him answer not comment or evaluate
2- when you talk to him keep calm and remember your tool is questions
3- when talking to him or listening look at him in the eye without any fear and with respect and consideration.
4- reproduce his answers before him and get a confirmation on them
5- remember that you can have a different opinion and in that case ask him questions about what if and produce your suggestions.
Thanks him and appreciate his followup