OPTIMAL SYSTEMS (OS), founded in 1991 in Berlin, counts today with 120 employees in its four locations in Germany, as well as with a wide network of partners in Austria, Switzerland and other European countries. Daily, many users are working with the software solutions of OS, which realised about 750 installations for over 450 customers in a variety of companies and organisations. Customers of OS are both in the industry or the service sector, and in the public administration or in the health system: about 100 city councils and regional administrations, and about 100 hospitals, clinics and rehabilitation centres work daily with the software of OS.