The OECD Halden Reactor Project is a joint undertaking of national nuclear organisations from 20 countries, who together sponsor a research programme under the auspices of the OECD - Nuclear Energy Agency. One of the Projects important research areas addresses human factors in control room design and operation. The simulator-based Halden Man-Machine Laboratory (HAMMLAB) has, since its establishment in 1983, been the main facility for conducting research in this area. It's objective is to provide knowledge for improving today's control rooms, through the introduction and evaluation of computer-based solutions for effective and safe control of the plant, across all process conditions. The laboratory facility will be introduced and the recent major upgrades, involving moving from one nuclear simulator to three full-scale simulators, plus an oil production platform simulator described. The aim of the human factors research programme itself is to provide knowledge about the capabilities and limitations of the human operators within a control room environment. Understanding the impact of new technology on operating personnel is crucial in decision-making concerning safety and efficiency for nuclear power plants. The Halden Project's new three year research programme in this area includes many aspects of human performance. The main elements of this programme will be briefly described in order to provide an overview of the breadth of the research topics currently of interest to the Projects 100 participating nuclear organisations.