1901 

 ISS is founded in Copenhagen, Denmark, under the
 name “Kjøbenhavn Frederiksberg Nattevagt”. Founded by a drapery
 wholesaler, the business was managed out of a living room and
 employed night watchmen to patrol the city’s back streets. Eventually
 coming under the control of C. L. David, a lawyer and businessman,
 ISS expanded into cleaning services.

1940's

 The German occupation of Denmark proved to be one of the greatest
 challenges that ISS would ever face. In addition to the hardships
 World War 2, ISS also had its offices commandeered by German
 officers. However, the company was able to grow its messenger and
 window cleaning services

1950's

 The private sector grew rapidly following World War 2, and the need
 for services gave ISS an opportunity to expand. Scandinavia,
 Switzerland and Germany each had ISS offices for the first time.

1970's

 After adjusting to the world-wide problems of the 1973 oil crisis, ISS
 focused on incorporating the move for Women’s Liberation.The
 company took numerous measures to meet this social change, and
 adjusted its social ethics appropriately

 1980's  
 and
 1990's

 Although ISS had become one of the world’s largest service 
 providers, the services industry had become increasingly competitive.
 ISS met this challenge by expansion and innovation, providing a far-
 reaching yet individually tailored range of services for an ever-
 growing list of global customers.

 2000
 and
 onwards

 Having realised the potential synergies and benefits for customers,
 ISS has adopted an exciting new program of providing integrated
 facility services. By sourcing all services needs through a single
 supplier, efficiencies and effectiveness can be better leveraged and
 developed.