IEEE operates the “Printed and Organic Electronics Working Group”5 that has published a widely recognized standard on organic transistor and materials characterization: IEEE Std P1620™. Based on this document a second standard has been published: IEEE Std 1620.1™ ”Test Methods for the Characterization of Organic Transistor Based Ring Oscillators “. In 2013 both of these have been adopted by the IEC as international standards IEC 62860 and IEC 62860-1, respectively.