Motivation Water electrolysis is a key component for sustainable and efficient hydrogen production. With the growing use of renewable energies, the interest in water electrolysis has increased considerably in recent years. In particular, PEM water electrolysis based on polymer electrolyte membranes is under development of different companies and research projects. With the technological progress, issues about durability, degradation mechanisms and accelerated stress tests are of high interest. This international workshop is organised within the NOVEL project. It is the goal to initiate an exchange of experiences and to start a discussion between different industrial and scientific stakeholders.