Full Title: Proceedings of the Third EUROCONTROL Human Factors Workshop: Integrating Human Factors into the Life Cycle of ATM Systems The Human Resources Team (HRT) of the European Air Traffic Control Harmonisation and Integration Programme (EATCHIP), now the European Air Traffic Management Programme (EATMP), has initiated the organisation of annual workshops on topics concerning Human Resources in Air Traffic Management (ATM), namely human factors. This report contains the proceedings of the third EUROCONTROL Human Factors Workshop held in Luxembourg in October 1998. The workshop addressed the integration of human factors into the life cycle of ATM systems.