AbstractSteel plated structures are important because they are used in large structures of vital importance for society. For the steel construction industry they are however of less importance as they are a small part of the turnover. Since the big disasters with box girder bridges more than thirty years ago very little money, public or private, has been spent on development of plated structures and hence progress has been fairly slow. Fortunately, the scientific interest in buckling problems is still high and this has led to some important steps forward. The European project of harmonizing design standards has brought plated structures onto the agenda again in connection with the conversion of Eurocode 3 to EN. There are several open questions, some of which are discussed in the context of new experimental and theoretical results.