Catalysis is recognized as one of the key drivers for wealth-creating industry, including the sustainability of our society. In this context, the EJD-PARACAT project aims to comprehensively explore for the first time the role of open-shell species in catalysis and chemical reactivity, which are notoriously difficult to study by conventional experimental tools. The project provides advanced training and expertise to 10 Early Stage Researchers (ESRs) focusing of how open-shell species participate in catalytic reactions. The objective is to enhance the availability of highly skilled researchers competent in advanced instruments and techniques, using a scientific approach and training protocol that is novel within the EU context. The basic tenet of the PARACAT training programme is that “knowledge ought to precede application”. By recognising and understanding the impact of open-shell species in chemical reactivity and catalysis, the ESRs will be equipped with the skills required to design more efficient catalysts and sustainable processes. The goal is to create a chain of knowledge whereby fundamental understanding is translated into practical applications by the synergic interaction between academic and industrial partners. The programme focuses on the multidisciplinary aspects associated with the role of paramagnetic species in key reactions of paramount importance for sustainable development, with emphasis on small molecule activation, selective oxidation of hydrocarbons and olefin polymerization, using homogeneous, heterogeneous or bio-catalysts. To do so it includes the input of (bio) chemists, (bio) physicists, industrial partners and an ethicist, delivering further emphasis on the ethics and social reflections of their research.