O2 implemented an integrated management system for planning, design, development, delivery, sales and service of communication and information technology, services and complex customer solutions, including system integration services, installation and operation of public communication networks and measurement of their parameters. The integrated management system involves a quality management system (ISO 9001), an IT services management system (ISO 20000-1), an environmental management system (ISO 14001), an occupational health and safety management system (ISO 45001), an information security management system (ISO 27001 + ISO 27017 + ISO 27018) and a business continuity management system (ISO 22301).