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  • German as a foreign language
    • Face-to-face Courses
      • Open German Courses
      • Personalized German Course
      • Group Training Courses
    • Online Courses
    • German University Preparation Programs
    • Publicly funded German courses
  • Foreign Language Courses
    • Face-to-face Courses
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  • Language Exams
    • Examination Preparation
      • telc German
      • TestDaF
      • IELTS
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    • German Exams - TestDaF
    • German Exams - telc German
      • telc German - FAQ
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  • Locations
    • Berlin
      • City and Local Area
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    • Cologne
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    • Marburg
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      • Contact
    • Munich
      • City and Local Area
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      • Video
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    • Radolfzell on Lake Constance
      • City and Local Area
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      • Video
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  • General Information
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Carl Duisberg


  • German as a foreign language
    • Face-to-face Courses
      • Open German Courses
      • Personalized German Course
      • Group Training Courses
    • Online Courses
    • German University Preparation Programs
    • Publicly funded German courses
  • Foreign Language Courses
    • Face-to-face Courses
    • Online Courses
    • Language Courses Abroad
  • Language Exams
    • Examination Preparation
      • telc German
      • TestDaF
      • IELTS
      • Further Language Exams
    • German Exams - TestDaF
    • German Exams - telc German
      • telc German - FAQ
    • German Exams - WiDaF
    • German Exams - PWD
    • English Exams - IELTS
    • English Exams - TOEIC
    • Language Exam Booking
  • Locations
    • Berlin
      • City and Local Area
      • Accommodation
      • Activities and Sports
      • Video
      • Contact
    • Cologne
      • City and Local Area
      • Accommodation
      • Activities and Sports
      • Contact
    • Marburg
      • City and Local Area
      • Accommodation
      • Activities and Sports
      • Contact
    • Munich
      • City and Local Area
      • Accommodation
      • Activities and Sports
      • Video
      • Contact
    • Radolfzell on Lake Constance
      • City and Local Area
      • Accommodation
      • Activities and Sports
      • Video
      • Contact
    • Saarbrücken
      • Contact
    • Beijing/China
    • Mexico
  • Our Clients
    • Institutions
    • Companies
    • School Classes and Groups
    • Private Customers
    • Agencies
  • General Information
    • Company
      • History
      • Quality Management
      • Executive Management
      • General Terms and Conditions In-Person Courses
      • General Terms and Conditions Online Language Courses
      • Legal Notice
      • Data Protection Policy
    • Contact
      • International Agencies
    • Downloads
    • Service
    • Sitemap
  • Booking
  • Language Courses
  • General Information
  • Company
  • Quality Management

Carl Duisberg Quality Management

ISO 9001 Certification

ISO 9001 Certification

We are one of the first providers of training and education to submit our quality management systems for review by an independent institution. Since 1997, the ISO 9001 certificate has offered a visible document of our compliance with the requirements of this worldwide quality model for our Language Courses, Language Travel, and International School Programs departments.

  • Service within 24 hours
  • Class visits by pedagogically responsible persons for quality assurance
  • Evaluation of the training by the participants

Carl Duisberg Centren

  • History
  • Quality Management
  • Executive Management
  • General Terms and Conditions In-Person Courses
  • General Terms and Conditions Online Language Courses
  • Legal Notice
  • Data Protection Policy

Our Locations

Berlin
Cologne
Marburg
Munich
Radolfzell on Lake Constance
Saarbrücken
Beijing/China
Mexiko

Our Clients

Kids and Teenagers
Students and Adults
Companies and Institutions

Carl Duisberg Centren

Company
Contact
Downloads

Our Products

Professional Training Programs
German Online Compact Course
German Language Camps
German Summer Holiday Course
     
© 2025 Carl Duisberg Centren • Hansaring 49-51 • 50670 Cologne • Germany
Legal Notice • Data Protection Policy