The scenarios of Environmental Control and Life Support Systems (ECLSS) which will be necessary within the next sixty years are outlined. From this the need for technologies are derived and condensed in a programme plan. Technologies necessary for the Columbus Initial Operating Configuration (IOC) are already under development. The status of this programme which includes the development of regenerative CO2-control, condensing heat exchanger, contamination control and monitoring and a low noise variable speed fan is described. The areas where the technological development should start immediately are discussed.