Collaboration in groups and committees

Berliner Mathematische Gesellschaft (BMG)
From 1992 up to 2007 I was a member of the Beirat (advisory board) of the BMG. From April 1^st, 2007 up to March 31^st, 2018 I was its secretary. Thereafter I'm still a member of the Beirat again. The executive board as well as the counselors and the accountants are elected during the general meeting for two years. The Beirat consists of at least four up to eight members.
The presentation of the BMG in the internet at http://www.math.berlin/ is developed by a team, which I join too.

Engineering standards committee Technische Grundlagen (NATG) of DIN
Department A: Einheiten und Formelgrößen (AEF)
By an article of Prof. G. Brecht in the DMV-Mitteilungen vol. 3/1997 I have been informed about the task that the DIN-Norm 1302 "Allgemeine mathematische Zeichen und Begriffe" will actually be revised. It is possible for anybody to make contributions to the creation and the revision of norms and standards (cf. page 4 of the leaflet "Etwas über DIN", published by DIN Deutsches Institut für Normung e. V., Burggrafenstr. 6, D-10787 Berlin in 1998).

DKE Deutsche Kommission für Elektrotechnik Elektronik Informationstechnik im DIN und VDE
Common commitee GK 112 „Größen und Einheiten“
Connected with the collaboration in DIN there was a chance and necessity for an engagement in the common committee GK 112 of the DKE, Stresemannallee 15, D-60596 Frankfurt am Main.