After an half year of mapping the small villages around Steinheim and another mapper who did the town itself we have now all the streets in OSM expect one which I can not find in the small village Eichholz.
I asked local people but they don't recognize the name, i think i have to ask the municipality where this street should be that they have in their list.

This is the report of the street names compared to a list of names that we have from a "Amtliche Bekanntmachung" (bulletin) for the elections :
http://osm.gt.owl.de/Strassenliste/Steinheim/Status.html

Thanks flohoff for the streetname check of half NRW, it's a great help and motivation to map all the missing streets.
http://osm.gt.owl.de/Strassenliste/

There is of course still enough to do like housenumbers, POIs, maxspeed....