The 9th International Symposium on ElectroChemical Machining Technology INSECT 2013 ties up to the successful past conferences in Brussels (2010), Vienna (2011) and Krakow (2012). The European conference serves as a platform for researchers and engineers working on electrochemical machining technologies. The symposium concentrates on the technical aspects of applications, e.g. in macro and micro structuring focusing quality and efficiency, as well as on the fundamental understanding of the processes at the electrolyte/electrode interface.