I'm a postdoctoral researcher at the University of Potsdam in Germany, and I'm preparing materials for a new study on German plurals. In order to figure out which words make for suitable test items, I need to know which plurals are known to native speakers of German.
The questionnaire takes about 5 minutes and all you have to do is write down the according plural form to the singular words you see. The only requirement is that you're a native speaker of German - current location or age don't matter.
Thanks very much for your help! :)