Like all good ideas, it's a simple one. Customers in a range of retail outlets from supermarkets to shoe shops can volunteer to round up their purchase with the words "Aufrunden, bitte!" ("round up, please!"). As there's a limit of ten cents maximum on the rounding-up, it is envisaged that a lot of people making a little difference will make a big difference.
The rounded-up money will go to charity projects which address current issues in German society, with 2012 projects being focussed on children and youth.
With its elements of a small behavioural change, the feeling of a movement for the greater good, the simple core idea and transparent nature, Deutschland rundet auf has the markings of an all-round success.