Feedback in German culture does not flow only from bosses to subordinates. Peers give each other feedback. In appropriate contexts, people provide feedback to those above them. Customers give feedback to businesses.
Multiple channels operate. This means you may receive feedback from colleagues, not just your manager. It also means you can provide feedback in multiple directions—including upward—when appropriate. Be open to feedback from various sources; valuable perspective can come from peers, customers, or subordinates, not just authority figures. German feedback culture expects people at all levels to both give and receive feedback appropriately.
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