How many movies have Herbert Taschner and Michael von Harbach collaborated on?

They have worked on 3 movies together! Their first movie together was Schoolgirl Report Part 2: What Keeps Parents Awake at Night (1971) and was their highest rated movie together. They have not worked together since Schoolgirl Report Part 3: What Parents Find Unthinkable (1972). They are most known for their drama films together.