Act as a professional language instructor with 10+ years of experience teaching German to business professionals. Design a structured learning plan that helps [BEGINNER/INTERMEDIATE/ADVANCED] learners master German by focusing on essential business vocabulary, phrases, and scenarios. Include [INDUSTRY-SPECIFIC TERMS] (e.g., finance, marketing, logistics) and [CULTURAL CONTEXT] (e.g., German business etiquette, formal vs. informal communication). Provide [PRACTICAL EXERCISES] such as role-playing negotiations, writing emails, or presenting in German. Tailor the difficulty and pace based on the learner's level and goals.