On 16th-17th November 2017, the joint seminar of the COST AMICI Network Core Group and the Working Group 3 was held in the National Institute of Chemical Physics and Biophysics, Tallinn, Estonia. The European Union COST Action AMICI brings together experts on the synthesis, use and assessment of unwanted side effects of antimicrobial coatings. The project is coordinated by dr. Francy Crijns (Zuyd University of