The FAIRNESS project aims at promoting a balanced harmonization of the Member States’ legal practices in relation to the implementation of several EU Directives (2016/343, 2016/800, 2016/1919, 2013/48/EU) when suspected or accused persons are involved in terror-related crimes or radicalisation. Further, it aims at exploring the coherence between the ‘spirit’ and previsions of the ‘Stockholm’s Roadmap’ contrasted with investigative and preventive practices (including Directive 2014/41/EU, and Council Framework Decisions 2002/584/JHA) involving suspects or accused persons for crimes related to terrorism in the pre-trial stage.