We will only be able to solve many materialographic tasks in the future, if we can also adequately prepare, image and analyze the 3rd dimension of the structure. Constantly improving methods allow us to do this almost without gaps on the micro, nano and atomic scale in various types of contrast. In order to do justice to the outstanding importance of this topic, including the best possible use of data, the Materialography Expert Committee of the German Materials Society has founded the “3D Microstructure Analysis Expert Forum”. All working groups of this expert forum give an insight into their specific possibilities and challenges in this issue. On behalf of this expert forum and all authors, I would like to thank the publisher Hanser for its willingness to make this issue also available in an open access version for the international community, so that you can download it at www.hanser-elibrary.com/loi/pm.
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