How many movies have Mamoru Oshii and Masatsugu Arakawa collaborated on?

They have worked on 5 movies together! Their first movie together was Patlabor: The Movie (1989) while their highest rated movie together was Ghost in the Shell (1995). They have not worked together since WXIII: Patlabor The Movie 3 (2002). They are most known for their animation films together.