The European Space Agency's mandate include to undertake research, development and demonstration of Earth Observation related space technologies. The MetOp satellites, which prototype is planned for 2003, will be the European contribution to the world meteorological polar satellite system, replacing the 'morning' satellites, provided by the U.S. until then. MetOp will embark a NOAA payload, plus European advanced instruments. The satellites are being developed by ESA in cooperation with EUMETSAT, which has the overall responsibility of the European Polar System EPS, which main objectives are to furnish data for operational meteorology and climate monitoring. Some instruments on MetOP will provide detailed information on the atmospheric temperature/humidity profiles, essential for weather forecasting. Other parameters will be available from the scatterometer and the global ozone instrument, continuation of the ERS series. The use of MetOp data is expected to contribute to the improvement of meteorological and other applications, plus to Earth Sciences research. Industrial activities for the manufacturing of the satellites started in February 1998, under the leadership of MMS (F).