Claus Michael Sattler advised me as founder and managing director of FACHARZT 24 Media GmbH on the implementation of interfaces between doctor systems and our online appointment booking system. The methods suggested by Mr. Sattler made it very easy for us to build interfaces without having to program the manufacturers of the doctor and practice information systems. I would consult Mr. Sattler again at any time for the implementation of complex IT systems. His expertise and creativity were an asset to us.