In general,do not call the German name,mostly not call its full name,just say its family name .
You had better add "Mr","Mrs","or" miss "or their title .
1.It isn't convenient between before 10 AM and after 4 PM.It isn't polite for German to talk without making an appointment in advance,and you cannot be late .
2.Don't directly offer some points without evidence in Negotiations.
3. Don't prevaricated,be ambiguous and drag shuffle in Negotiations.
4. You mustn'tuse a kidding way to break the silence in Negotiations.