ImprovEAW research project is a comparative legal study into European Arrest Warrants (EAW) defects, the difficulties resultant from the form, that have potential to impact mutual trust among Member States. The research is focused on practical problems and, thus, it counts with practitioners from Belgium, Greece, Hungary, Ireland, the Netherlands, Poland, and Romania. The method is to, via questionnaire, examine the cases of the Partner countries, in order to understand root causes and propose solutions. ImprovEAW’s aim is to develop common solutions and, where applicable, propose recommendations to the EU and/or Member States.