In Japan, who you are matters as much as what you say. Before your audience evaluates your argument, they evaluate you. Do you have relevant expertise?
What is your track record? What is your position? Who endorses you?
What is your relationship with the audience? These questions shape how everything you say will be received. The same argument that persuades coming from a credible source may fail from someone without standing.
This means persuasion preparation includes establishing your right to be heard—through demonstrated competence, through building relationships, through securing endorsements, through appropriate position. You cannot separate your argument from yourself. Your credibility is the foundation on which your argument rests.