“What about the differences in how decisons are executed?”
This is a very complex, and controversial, topic. At its core it is about leadership logics, about how we lead, and how we want to be led. It is deeply personal because it involves the day-to-day interactions between a team-lead and a team-member.
Let me point you to three things:
There are differences between Americans and Germans in terms of Leadership – Strategy Modification.
And there are clear differences between the two cultures in how they handle giving critical (negative) feedback, especially in the interaction between team-lead and team-members.