I'd like to provide a list of items (topics for a short paper, in my case) and have students claim one once they decide what to write about, but I want the choice to be exclusive so that there are no repeats. What tool can I use to do that? It has to allow students to make a choice, but that choice has to disappear or be otherwise unavailable once someone else has claimed it. There will be many more choices than students so I'd be OK if students change their minds and release a topic, as long as they then claim one that's open at that time.
Thanks for pointers in the right direction.