The ISS Group was founded in Copenhagen in 1901 and has grown to become one of the world’s leading Facility Services companies. ISS was originally short for International Service System and from 2001 short for Integrated Service Solutions, but is only used as the acronym today.
ISS offers a wide range of services: 

Facility Management
Cleaning Services
Support Services
Property Services
Catering Services
Security Services

ISS employees create value by working as integrated members of their clients’ organisations. A key component of the ISS HR strategy is developing capable employees in all functions. Team spirit and self-governance are encouraged, as is voluntary participation in additional training and multidisciplinary workflows.

Besides developing their employees, ISS ensures compliance with Health, Safety and Environment (HSE) regulations. See their section on Corporate Responsibility here.

They demonstrate their social and ethical commitment through the ISS Code of Conduct, their membership in the UN Global Compact and by honoring the principles laid down in the Union Network International (UNI) agreement.