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This focus meeting aims to bring together active researchers to discuss recent advances in the area of calibrations and standardization, to share successes and failures, and to foster a community of support in solving the challenging problems of calibration and standardization common to many different projects for which accurate and precise calibration and standards are vital to their success. This is a cross-disciplinary topic of impact on stellar physics, galactic and extragalactic astrophysics, solar physics; solar system among others fields, and involves instrumentation, observational techniques (photometry, spectroscopy, polarimetry) and multi-wavelength domain. This Focus Meeting’s goals are to provide a global, in-depth overview and documentation on the current state of the science of calibration in this critical area of modern astronomy. Many individual missions/facilities hold periodic calibration workshops or conferences, however these are by necessity focused on the specific needs of their projects. Discussions on worldwide efforts to establish new standard sources, or on standard software package in central location to be used by many astronomers, rather than individual software packages on individual computers, or on data format standards, or the synergies between projects need a worldwide framework well provided by an IAU GA.