D|E
Public/Private Utility Provision
BSR
Deutsche Bahn AG
Deutsche Telekom AG
Government Ministries
Housing Councils
Local Energy Providers
Local Government
Public Transit Authorities

Health Research
National Health Education Agency (BZgA)
DAK
IKK
Techniker Krankenkasse

Media (Publishers)
Bauer
Bertelsmann
Burda
G+J
Hoffmann & Campe
Springer
Ringier
VVA

Media (Print)
Berliner Morgenpost
Die Woche
DM
Express
Hamburger Morgenpost
HNA
impulse
MAX
Neue Presse
Ruhr-Nachrichten
Stern
TV Today
WELT
Finance Market Research
American Express
Bankgesellschaft Berlin
Citibank
Continentale Versicherung
Dresdner Bank
Frankfurter Sparkasse
Gerling
Sparkassen- und Giroverband Hessen-Thüringen
Union Investment

Energy Market Research
e-on
EWE
GEW Köln
HEW
RWE
Stadtwerke Dortmund

Media (Radio)
Alster Radio
BBC
Belgischer Rundfunk
Radio Bremen
Radio ffn
Radio NRW
SFB

Media (Television)
CNN
CreaTV
Deutsche Welle
EuroNews
Hessischer Rundfunk
RTL
ProSieben Sat.1 Media
SFB
ZDF

Petroleum and Automobile Industry
Aral
DaimlerChrysler
Elf Oil
Volkswagen