CO2 utilisation technologies, also known as carbon capture and utilisation (CCU) or CO2 re-use, capture CO2 and convert it into new products or services. CCU is gaining momentum as academia, industry and governments seek solutions to reduce emissions and create new business opportunities. EIT Climate-KIC and other bodies (e.g. The Scientific Advice Mechanism (SAM) of the European Commission) and practitioners have recognised the need for a set of common assessment guidelines for CCU assessment. As research and technology readiness levels in CCU mature, investors and funders require clarifications on the potential impact of these technologies and these guidelines seek to do just that. The guidelines were produced in partnership with the University of Sheffield, RWTH Aachen, IASS Potsdam, TU Berlin, and supported by the Global CO2 Initiative at the University of Michigan, EIT Climate-KIC and several other partner organisations. The first version of these guidelines was published and disseminated in October 2018 in Brussels.