CHEOPS [ESA] (Characterising Exoplanet Satellite) is the first mission dedicated to searching for transits of exoplanets by means of ultrahigh precision photometry on bright stars already known to host planets. It will provide the unique capability of determining accurate radii for a subset of those planets for which the mass has already been estimated from ground-based spectroscopic surveys. CHEOPS will also provide prime targets for future instruments suited to the spectroscopic characterization of exoplanetary atmospheres. IA is strongly contributing to this mission participating both in the board and the core science team of the mission. This work is also closely related to the science data archive which is being developed by our industry partners (DEIMOS), contributing to the development of stronger relations with the Portuguese industry in the area of scientific-related software. Moreover there is a contribution to the mission science operation center, more specifically for the CHEOPS data reduction pipeline where we are responsible for the calibration of the pipeline.