How many movies have Katrin Schneider and Malah Helman collaborated on?

They have worked on 1 movie together! Their first movie together was Warum Ulli sich am Weihnachtsabend umbringen wollte (2005) and was their highest rated movie together. They have not worked together since Warum Ulli sich am Weihnachtsabend umbringen wollte (2005).